s 57 Punishment of certain grave crimes.
(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (3) A person detained pursuant to the directions of the Secretary of State under section 205 or 206 of the Criminal Procedure (Scotland) Act 1975 . . .shall, while so detained, be deemed to be in legal custody. (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .