Two men have been charged after a raid on a “£1m diazepam factory” in Midlothian.
Police said they discovered a “sophisticated criminal enterprise” and seized equipment suspected of being involved in the production of the drug – including a pill press and about 900,000 tablets.
Officers swooped in on a property during an intelligence-led operation in the Danderhall area on Tuesday.
A range of other substances – including powders currently undergoing further forensic testing – were also recovered.
Police Scotland said the items recovered had an estimated street value of more than £1m.
Two men, aged 42 and 60, have been arrested and charged in connection with the seizure and are expected to appear at Edinburgh Sheriff Court on Thursday.
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Detective Chief Inspector Bryan Burns said: “Officers discovered a sophisticated criminal enterprise believed to have been producing vast amounts of illegal drugs with a significant quantity, and mechanisms to produce more, successfully seized.
“Our officers are removing drugs from communities right across Scotland day in, day out. In addition, we will continue to do everything in our powers to strip those responsible of their criminal assets using the Proceeds of Crime Act, so they do not benefit from criminal activity.
“This operation underlines our commitment to the Serious Organised Crime Taskforce and the country’s Serious Organised Crime Strategy.”