I am fairly sure that in Nevada, at least, verbal bets are not legally binding. This comes from the days when people would literally run up to the craps table hollering "$25 on hard six" and the casino would take the bet, presumably from known reliable players and/or already had the chips on the rail, etc. At some point, the GCB put a stop to that.
So the bottom line is that the rule/law as it's written is 180 degrees out of phase with what is absolutely enmeshed in poker DNA - that verbal bets are binding.
I had a first hand experience with this and wrote about it in the
PokerStars blog. A postscript to that story is that the cardroom manager (who knows his sh*t) later told me that he cannot legally force the person to surrender their chips. What he does (i.e. not his first time around this block) is make the other player whole from his own budget, and then tell the offender that they're not playing in the room again until the offender makes the room whole.
I have lost track of the number of times I've asked dealers to have players push chips across the line ("I call", no chips move) or push an entire stack rather than the stupid little one chip call. The dealers always look at me askance, "He said he called" "It's clear he's calling." I have even tried the "Ya, but the cameras can't see a verbal call" line, again without success. Perhaps now they'll understand better if somebody makes a scene about it.
I honestly don't know if it matters if the chips move across the line, but I'm pretty sure that if you try to grab chips out of a mixed pot in the middle of the table, you're leaving in handcuffs. It's a weird, invisible legal line, and I guess we gotta start enforcing it, which sucks.
Regards, Lee