Police are investigating claims that bags of cannabis were left in a hire van used by officers to transport them from the scene of a drug seizure.
The drugs were reportedly discovered by a company driver who picked up the van from Coatbridge police station, North Lanarkshire, after the raid and drove it back to his base.
Staff at Mitchell's Hire Drive called police who re-hired the van in order to remove the drugs.
Police say they are investigating what happened.
"We can confirm we are investigating a report that a vehicle, hired by Police Scotland, has been returned to the hire company, allegedly with what is believed to be police productions inside," a Police Scotland spokeswoman said.
"Inquiries are at early stage to establish the circumstances and it would be inappropriate to comment further."