The UK terrorism watchdog has said there are dangers to releasing possible dangerous terrorists onto the streets after two years.
But David Anderson QC said it allows focus regarding what to do with them.
He was speaking to the Home Affairs Committee, which is hearing evidence on the terror prevention measures Tpims.
It comes after fugitive terror suspect Mohammed Ahmed Mohamed escaped surveillance last month by dressing in a burqa.
More top news
A US doctor has been accused of killing a lion during an illegal hunt, a week after it emerged dentist Walter Palmer killed Cecil the lion.
Mostly dry overnight in the east, strong winds and showery rain affecting Scotland & Northern Ireland
A couple have got married for the second time after the bride forgot their first big day following a car crash.