Two men from the Dundee area are being investigated over allegations that they tried to smuggle class A drugs through Glasgow Airport.
The pair, aged 25 and 27, were arrested by officers from the National Crime Agency amid claims they were carrying the drugs while passing through the airport.
They have now been reported to the Crown Office and Procurator Fiscal Service.
It is understood that the investigation into the alleged offences could take months.
No details have been revealed on whether the men alleged to have been transporting drugs were trying to leave the country or returning to Scotland.
A spokesman for the National Crime Agency, whose role is to “disrupt and bring to justice those serious and organised criminals who present the highest risk to the UK”, confirmed its involvement.
He said: “We have reported two people to the Crown Office in Paisley in relation to these alleged offences.”
The Crown Office confirmed it had been alerted to the allegations.
“The procurator fiscal has received a report concerning two men, aged 27 and 25, in connection with an alleged incident said to have occurred on August 8 2015 in Paisley,” said a spokesman.
“The report is under consideration.”
Up to 7.7 million passengers and 80,000 flights pass through Glasgow Airport every year, flying to 110 destinations worldwide.
In recent years it and other Scottish airports have been the scene of several drug smuggling incidents.
One of the most high profile was in 2010, when former baseball player Juan Guerrero was caught with £1.28 million worth of cocaine in his suitcase at Glasgow Airport after travelling from the United States.
He received an eight-year prison sentence.
Guerrero had travelled via Tucson, Houston and Newark in the US, where it was thought security might be less rigorous, and then on to Glasgow.
Officials at the airport received considerable praise for preventing the drugs from getting on to the streets.