Ok I know this is kinda off the subect but it gets to me.......
You say your son does not own a venomous snake other then a Mang and a Hognose..........
WELL
A hognose is not "venomous" a Mang is......... There is a difference.
I am not sure why you would allow your son to own a Hot when you do not have the knowledge yourself...........Sure mangs are good stepping stone for hot keeping but they are not as easy to keep as some think and you may know by now.
They have a striking range that puts most snakes to shame. and as I said before their venom is nasty but it is their delivery system that they lack that puts them down on the charts. Dr. Bryan Fry said it is like a death adder lite. He has wrote many papers on the mangs venom and delivery system. I recommend his site to anyone that does not know about it
http://www.venomdoc.com/
I have learned a lot from this mans knowledge and papers!
Knowledge is power and knowing everything you can about a species before you bring it onto your home should be your first thing.
I am not trying to tell you how to raise your son with the next statement but I think you will find it may help.
Sit down with him and pick out a snkae. Study where it comes from learn everything you can and then bring it into your home and work with it together................
A good friend told me this and it makes so much sence.....lol
But I seen Mike say the mang is no hot. He did not know. IMO he should not even of had the snake then........