Of all the snakes I have ever owned, caught, and handled i have only been musked by wild ones. Aside from that it hasnt happened to me.
With that said I consider my self very very lucky considering the vast number of animals I have held. It is always a possibility but its a very low chance of it happening.
Oh and they only really poop as much as you feed them and sometimes less. so if you feed once a week expect a poop once a week. and if you get it on that small window of time wash up and by a lotto ticket.