Margaret Ferrier has been arrested and charged in connection with an alleged breach of coronavirus restrictions.
The Rutherglen and Hamilton West MP made a trip from Glasgow to the House of Commons while waiting for results of a Covid-19 test – and a return journey after being informed she had the virus.
A Police Scotland spokesperson said: “We can confirm that officers today arrested and charged a 60-year-old woman in connection with alleged culpable and reckless conduct.
“This follows a thorough investigation by Police Scotland into an alleged breach of coronavirus regulations between 26 and 29 September 2020.
“A report will be sent to the procurator fiscal and we are unable to comment further.”
Ferrier, who is continuing on as an independent MP after her suspension from the Scottish National Party, has repeatedly ignored calls to resign.
The MP took made a train journey from Westminster to Scotland after testing positive for Covid-19.
She had already travelled south by rail to attend parliament despite developing symptoms of the virus and having to book a test.
The Metropolitan Police said Ferrier would be spared charges because new regulations on self-isolation came into force after she was tested.
However, the force referred the matter to Police Scotland for consideration.