can't think of the word where: someone is actually guilty but their allowed to act like their innocent. like nothing happened

Answer 1

Maybe this:

http://www.google.com/search?rlz=1C1GGGE_enUS379US379&sourceid=chrome&ie=UTF-8&q=nolo+contendere

Answer 2

put on a poker face?

Answer 3

or perhaps "acting dumb."

Sra