Chilton said he would have preferred even tighter limits for certain contracts, particularly precious metals, but added that simply establishing a position limit regime is critically important.

FORBES: CFTC Position Limits Rule Divides Agency, Angers Market Participants

The terms of Lown's release mean he must stay at a hostel, keep to a curfew and, critically, stick to an alcohol limit similar to that for drink-driving.

BBC: Working with the UK's most dangerous criminals