Nothing more from the OP so we can presume that he's been done for stealing his own bike.
How do they prove it's not your bike?
I've got no proof my bike is mine, lost the receipt years ago. Say the policeman had literally been sat in his car watching me cut through the lock and start to ride away - how would I prove my innocence? I could phone my girlfriend or many one or two mates who would recognise the bike as mine - but then the policeman could say we were collaborating to steal the bike.
Or if I really was a bike thief, how do I convince the policeman to let me off scot-free!