I have kept hots continuously for 15 years. I have had Eastern Diamondbacks, Canebrake rattlers, Black-tailed rattlers, Red Diamond rattlers, Eyelash Vipers, Urutus, Timber rattlers, Gaboon Vipers, Rhino Vipers, Russells Vipers and Forest Cobras. I have never had an escape. No close calls. No bites. I think you need to be careful. Don't do anything you should not do. Never drop your guard. Never ever be in a rush when working with them.
Dan