Before revision: In the UK, the first public body to admit using IMSI catchers was the Scottish Prison URL though it is likely that the Metropolitan Police Service has been using IMSI catchers since 2011 or before.
After revision: In the UK, the first public body to admit using IMSI catchers was the Scottish Prison Service, though it is likely that the Metropolitan Police Service has been using IMSI catchers since 2011 or before.