Re-opening the raising in NLHE cash game

[Headhunter13]

Playing in a local card room, there was $80 in the pot. Player A opened for $100. B called, and C shoved for a total of $145. Player D asked if the shove re-opened the betting. Floor came over and ruled that it had to be half of the original bet to re-open it ... so it did not re-open it in this instance.

There was then some discussion about whether it takes a full raise or half raise to re-open. Floor said that wherever he's played ... specifically Atlantic City, Caesar's Louisville, and Argosy (Cincinnati), that they all use the "half-raise" rule.

Clearly if half-raise if the house rule, then it's the house rule. Just curious if anyone has first hand knowledge of "half-raise" or "full-raise" at these casinos ...and others in general (Vegas, Tunica, CA, etc).

Thanks,

--Headhunter