Pass interference is only called if a player is clearly and obviously restrained (held, pushed) from attempting a catch. Unavoidable contact when two or more players are making a simultaneous, bona fide attempt to move toward, catch or bat the pass is NOT pass interference. Additionally, a player unintensionally 'in the way' of a receiver will not be called for pass interference.
As in all codes of football, pass interference is a judgement call.
Last updated: Jan.29.2018