Replying to I think i got ruufied

so this last weekend i went out to a house party in my town and im pretty sure i got ruufied. first off i walked to the party with some of my friends and thats like the last thing i rememebr. apparently i got picked up by a cop at like 3am wandering around in the street with no pants, shirts, or shoes on, just boxers (my roommate told me this) he said the cop was able to get me to tell him where i lived so he rang the doorbell and left me with my roomie. i lost my brand new droid and my wallet, whcih had my license and 2 debit cards in, along w 40 dollars cash. im pissed, but i also have bruises like all over my body, mostly on my legs and no idea how they got there. my friends said they left early from the party so they dont really kno what happend. how can i find out who ruufied me because i dont remember anything?