What is Sinn Fein’s position on policing?

Gerry Adams was asked at the policing meeting in Derry last night whether he would encourage young nationalists to join the PSNI. His reply, according to one non party observer who was there, “it is up to the P S N I to prove themselves”. It’s the old conditionality clause. Of course that may simply be a tit for tat for the DUP’s refusal to harden May 2008 from a target date to an actionable deadline. But it begs the question, ‘what position is the party actually asking it’s support to back’?