Thank you. I am aware that this is the practice, but never seen the legal basis for it.

Do you have a legal reference or the like that someone with a venomous license, in his presence, is allowed to have a non-licensed person to handle venomous reptiles? ...with whatever conditions?

FL FW keep saying you can not handle unless you hold a license or they could "add" to someone's else license in a special/temporary capacity.