HR.414 would "require mobile phones containing digital cameras to make a sound when a photograph is taken".
Now, I appreciate the sentiment and intention of the bill. There's always going to be some pervert or frakwad who thinks his techmology gives him a right to invade a woman's privacy.
But I think the better way to combat the practice is to allow the victim to stomp the erstwhile snapper in the balls until the sumbitch coughs up blood. That'll deter the little shits.
And on a more personal note, an audible click may have startled the Yeti I saw on the bus that one time.