Police in West Yorkshire are warning suppliers and sellers of what are known as legal highs to dispose of any remaining stock.
A ban on the psychoactive substances came into effect today, which means offenders could face up to seven years in prison - if they continue to sell them.
The chemicals, sold under names such as spice and pink panther, are designed to give users the same effect as drugs like cannabis and cocaine.
Latest headlines: Urgent appeal launched to trace missing 14-year-old Leeds girl and NHS in Yorkshire spends millions on private ambulances
Oli Woodcock
BBC Local Live, Leeds
The latest headlines in Leeds and West Yorkshire so far this evening include:
On the evening of Wednesday 15 June BBC Radio Leeds will be holding a special EU referendum debate at Bradford College - and we’d like you to be part of the audience.
BBCCopyright: BBC
The live debate will be hosted by Andrew Edwards and will take place at Bradford College between 18:00-20:00. It will be recorded for broadcast on BBC Radio Leeds and filmed for Made in Leeds TV and social media.
Labour chief Clr Pandor was expected to be voted into the top job at Kirklees Council but his own actions in ousting previous leader David Sheard came back to bite him.
Charis Scott was last seen at her home address in Harehills at about 1745 on Tuesday 24 May.
Charis is described as white, 5ft 7ins tall, slim build, with shoulder-length dark hair. She was last seen wearing black trousers, black trainers and a black coat.
Quote Message: We are very concerned for Charis's welfare, given her age, and we urgently need to hear from anyone who has seen her or who knows her current whereabouts." from Marc Bowes Detective Inspector, Leeds District Safeguarding Unit
We are very concerned for Charis's welfare, given her age, and we urgently need to hear from anyone who has seen her or who knows her current whereabouts."
Vote Leave tell ex-BNP official Mark Collett to stop using their material
Mark Collett and his girlfriend Eva Van Housen - who has a swastika tattoo - have been handing out Vote Leave leaflets and badges from an official-looking stall in Leeds city centre.
Mr Collett was chair of the BNP Youth Wing before the party expelled him.
Travel update: Slow traffic on westbound M62 entry slip road from M621
Congestion is now backing up to J28, A650 (Tingley).
BBC Radio Leeds has travel and traffic updates throughout the day to keep you moving.
Online degree units to cut tuition fees
A UK online university network is claiming a "breakthrough moment" with a project which will allow students to cut the cost of a Russell Group degree by studying part of it online.
FutureLearnCopyright: FutureLearn
A Futurelearn online course will provide credits towards a University of Leeds undergraduate degree.
It will mean reducing the time and cost of tuition fees for a full degree.
Futurelearn chairman Peter Horrocks says this will provide the flexibility needed by many students.
Watch: Grand lift auto? Strongman walks off with car
Daragh Corcoran
Reporter, BBC Radio Leeds
Some of the strongest men in the world are heading back to Leeds.
The first direct arena will play host to the Europe’s Strongest Man and the World Deadlift Championships this summer.
HS2 is an over-priced, gold-plated project and will fail in many of its objectives, a group of transport experts has warned. The planned route which will link London with Birmingham, Manchester and Leeds, has a £50bn price tag.
BBCCopyright: BBC
The academics support high-speed rail overall, but say HS2 is five times more expensive than its French equivalent.
They argue that the benefits of HS2 can be achieved much more cheaply, with lower CO2 emissions, and they want their analysis examined by government.
New 20mph speed limit ready to roll in Hebden Bridge
This evening will be largely dry overnight, with the return of some mist and fog on high ground. Temperature lows of about 9C (48F).
Legal high seizures made in West Yorkshire
Phil Bodmer
Journalist, BBC Look North
Shops in Bradford and Leeds that used to sell so-called legal highs can expect a visit from the police later - because as of midnight the the substances became illegal.
Following the ban, officers will be going to the shops to talk to their owners about the change in the law.
Live Reporting
Oli Woodcock
All times stated are UK
Get involved
Lindsey WilsonCopyright: Lindsey Wilson View more on twitterView more on twitter - Police in Leeds are urgently appealing for information to trace a missing 14-year-old girl
- Research by the BBC has revealed a dramatic rise in the use of private ambulances to deal with emergencies in Yorkshire
- Shops in Bradford and Leeds that used to sell so-called legal highs can expect a visit from the police - because the substances became illegal at midnight
BBCCopyright: BBC Huddersfield ExaminerCopyright: Huddersfield Examiner WYPCopyright: WYP Mark CollettCopyright: Mark Collett FutureLearnCopyright: FutureLearn View more on twitterView more on twitter BBCCopyright: BBC Halifax CourierCopyright: Halifax Courier - Research by the BBC has revealed a dramatic rise in the use of private ambulances to deal with emergencies in Yorkshire
- Shops in Bradford and Leeds that used to sell so-called legal highs can expect a visit from the police later - because the substances became illegal at midnight
- A £10m plan to protect part of Calderdale from flooding is announced by the Environment Agency
BBCCopyright: BBC View more on twitterView more on twitter BBCCopyright: BBC
Latest PostGoodbye: Our live coverage across the day
Oli Woodcock
BBC Local Live, Leeds
Live updates for Leeds and West Yorkshire have finished for the day.
Special thanks to Lindsey Wilson who's sent in this picture of cygnets at Pugneys lake near Wakefield.
Nick and the team will be back from 08:00 on Friday with the latest news, sport, weather and travel from across the county.
More news from West Yorkshire: Coming up on BBC Look North
BBC Look North, Yorkshire
Do join us for Look North on BBC One at 18:30 - the Environment Agency is proposing £10m in works to reduce the flood risk from the Calder and its tributaries.
About 370 properties were flooded on 26 December as heavy rain affected the Calder Valley.
Construction work on the scheme is expected to begin by the end of 2016.
Our reporter Spencer Stokes is in Mytholmroyd with the latest:
Watch: Legal high seizures in Leeds
Phil Bodmer
Journalist, BBC Look North
Police in West Yorkshire are warning suppliers and sellers of what are known as legal highs to dispose of any remaining stock.
A ban on the psychoactive substances came into effect today, which means offenders could face up to seven years in prison - if they continue to sell them.
The chemicals, sold under names such as spice and pink panther, are designed to give users the same effect as drugs like cannabis and cocaine.
Latest headlines: Urgent appeal launched to trace missing 14-year-old Leeds girl and NHS in Yorkshire spends millions on private ambulances
Oli Woodcock
BBC Local Live, Leeds
The latest headlines in Leeds and West Yorkshire so far this evening include:
EU Referendum debate: West Yorkshire decides
Oli Woodcock
BBC Local Live, Leeds
On the evening of Wednesday 15 June BBC Radio Leeds will be holding a special EU referendum debate at Bradford College - and we’d like you to be part of the audience.
The live debate will be hosted by Andrew Edwards and will take place at Bradford College between 18:00-20:00. It will be recorded for broadcast on BBC Radio Leeds and filmed for Made in Leeds TV and social media.
Fancy taking part? Click here to fill in an application form.
Travel update: Very slow and queuing traffic on the Westbond M62, at J25
BBC Travel
Very slow and queuing traffic on the westbound exit slip road on the M62 at J25, A644 (Brighouse).
Congestion backing upto Hartshead Moor Services.
Do remember, BBC Radio Leeds has travel and traffic updates throughout the day to keep you moving.
Listen: Leeds man breaks world record
BBC Radio Leeds
With eight minutes to spare,a man from Leeds has broken the world record by travelling through 12 EU countries in under 24 hours.
Adam Leyton used public transport to complete the challenge and raise money for charity.
He's been speaking to Gayle Lofthouse on BBC Radio Leeds.
'Put up or shut up!' Angry Kirklees Council leader-elect Shabir Pandor vows to fight on
Huddersfield Examiner
Kirklees Council leader elect Shabir Pandor vowed to fight on after being sensationally snubbed in a council chamber vote.
Labour chief Clr Pandor was expected to be voted into the top job at Kirklees Council but his own actions in ousting previous leader David Sheard came back to bite him.
Watch: Leeds boxer Nicola Adams continues her bid to become a world champion
Tanya Arnold
BBC Sport
Leeds boxer Nicola Adams will this afternoon continue her bid to become a world champion.
She's fighting in the semi-finals in Kazakhstan. If she wins she'll go through to tomorrow's final, guaranteeing herself at least a silver medal.
Adams has won gold at every major tournament except the world championships.
Urgent appeal launched to trace missing 14-year-old Leeds girl
Police in Leeds are urgently appealing for information to trace a missing 14-year-old girl.
Charis Scott was last seen at her home address in Harehills at about 1745 on Tuesday 24 May.
Charis is described as white, 5ft 7ins tall, slim build, with shoulder-length dark hair. She was last seen wearing black trousers, black trainers and a black coat.
Vote Leave tell ex-BNP official Mark Collett to stop using their material
Vote Leave have distanced themselves from a former top BNP official who has been using their EU referendum campaign material.
Mark Collett and his girlfriend Eva Van Housen - who has a swastika tattoo - have been handing out Vote Leave leaflets and badges from an official-looking stall in Leeds city centre.
Mr Collett was chair of the BNP Youth Wing before the party expelled him.
Travel update: Slow traffic on westbound M62 entry slip road from M621
BBC Travel
The westbound M62 entry slip road from the M621 is partially blocked and there is slow traffic at J27, M621 (Gildersome) because of an accident.
Congestion is now backing up to J28, A650 (Tingley).
BBC Radio Leeds has travel and traffic updates throughout the day to keep you moving.
Online degree units to cut tuition fees
A UK online university network is claiming a "breakthrough moment" with a project which will allow students to cut the cost of a Russell Group degree by studying part of it online.
A Futurelearn online course will provide credits towards a University of Leeds undergraduate degree.
It will mean reducing the time and cost of tuition fees for a full degree.
Futurelearn chairman Peter Horrocks says this will provide the flexibility needed by many students.
Watch: Grand lift auto? Strongman walks off with car
Daragh Corcoran
Reporter, BBC Radio Leeds
Some of the strongest men in the world are heading back to Leeds.
The first direct arena will play host to the Europe’s Strongest Man and the World Deadlift Championships this summer.
HS2 rail link 'over-priced' say transport experts
HS2 is an over-priced, gold-plated project and will fail in many of its objectives, a group of transport experts has warned. The planned route which will link London with Birmingham, Manchester and Leeds, has a £50bn price tag.
The academics support high-speed rail overall, but say HS2 is five times more expensive than its French equivalent.
They argue that the benefits of HS2 can be achieved much more cheaply, with lower CO2 emissions, and they want their analysis examined by government.
New 20mph speed limit ready to roll in Hebden Bridge
Halifax Courier
A new 20mph speed limit will be in force in Hebden Bridge as part of the Love our Streets campaign from tomorrow.
Love our Streets aims to help make our streets safe for everyone who lives and travels in Calderdale.
Latest headlines: NHS in Yorkshire spends millions on private ambulances and ban on legal highs comes into force
Oli Woodcock
BBC Local Live, Leeds
The latest headlines in Leeds and West Yorkshire so far this lunchtime include:
West Yorkshire's weather: Cloud clearing throughout the afternoon
Owain Wyn Evans
Weather presenter, BBC Look North
It will remain a little misty and murky but clearing throughout the afternoon with a few bright spells possible later.
Light winds and highs of about 15C (59F).
This evening will be largely dry overnight, with the return of some mist and fog on high ground. Temperature lows of about 9C (48F).
Legal high seizures made in West Yorkshire
Phil Bodmer
Journalist, BBC Look North
Shops in Bradford and Leeds that used to sell so-called legal highs can expect a visit from the police later - because as of midnight the the substances became illegal.
Following the ban, officers will be going to the shops to talk to their owners about the change in the law.
Net migration to UK rises to 333,000 - second highest on record
Net migration to the UK rose to 333,000 in 2015, according to the Office for National Statistics.
The net figure is the number of people moving to the UK for at least a year, less the number leaving the UK.
The ONS figures estimate that net migration for EU citizens was 184,000.