BBC NEWS Scottish Socialist MSP Rosie Kane has been taken into police custody over the non-payment of a fine.
The £150 penalty was imposed following an anti-nuclear protest at the Faslane submarine base on the Clyde last year.
The MSP said a warrant was issued for her arrest and she handed herself in. She said she expected to be jailed.
Strathclyde Police confirmed Ms Kane had been taken into custody at Helen Street police station in Govan. She is due to appear in court on Thursday.
Ms Kane said: "As a member of the Scottish Parliament I am accountable for my actions and so I am handing myself in to the police.
"This year has been the 60th anniversary of the annihilation of Hiroshima and Nagasaki.
"The defiant stand I am taking serves notice that the nuclear disarmament movement will always speak out as long as these illegal weapons continue to threaten the entire human race."
A police spokeswoman said: "A 44-year-old woman has been taken into custody and is expected to appear in court in relation to the alleged non-payment of a fine."
