As I already said, no one is proposing bathroom police. It is absolutely impractical to do a penis check or asking for a BC from everyone entering a public bathroom so in that respect is unenforceable. And I dare say that if someone, a trannie like say looking like Ru Paul went into a Ladys room, most would not bat an eyelash. And if Ru Paul hit on you at a bar after a few drinks, you might have a Lola story to tell.
Thats not the point.
The law came in response to a Charlotte City Council ordinance mandating that all public facilities should allow people to use the bathroom or locker room corresponding to their gender identity. The North Carolina statute overturned the rule, stating that public accommodation policy can only be established at the state level.
http://www.wnd.com/2016/04/trump-scolded-on-n-c-bathroom-bill-you-got-key-fact-wrong/
My point was and is that if anyone of any gender can use the bathroom of his/her/shims/its choice, the prosecution of any sexual assaults becomes more difficult to prove. If a man being in a womens rest room is not on its self at all suspicious or out of the ordinary. It removes the motive out of the equation.
Public places will just make family rooms or single occupant unisex bathrooms