There are some Religious Groups that use Bible scripture to show their faith by handling dangerous snakes in their worship services. I live in Tennessee and this is still practiced here, and in Kentucky, West Virginia, and other states as well.
Venomous snakes are certainly dangerous, and every now and then you hear a story in the news or on TV about a "Religious Wacko" that got bit by a Rattlesnake in a church service.......
But for the "One you actually hear about" there are possibly hundreds or thousands of "Snake Handling Sessions" that go on without incident.
These Parishioners don't just go out into the forest and catch a wild rattle snake and then take it to church on Sunday, rather, they obtain these snakes when young and take very good care of them and raise them. Even though venomous (usually Rattlesnakes) they become somewhat tame and are handled frequently just like I do my Corn snake.
Which proves, that even a "Mean Ol' Poisonous Snake" won't always bite. Snakes bite for 2 reasons. 1). to obtain food, and 2). to protect themselves.
A snake knows it can't swallow a human, so it's not going to bite for food. Most snake bites occur because the snake is alarmed, scared, startled or hurt.
If the snake has no reason to fear you then it won't bite.
This is why hundreds or possibly thousands of people are able to "Under the Name of God" handle poisonous snakes successfully and not get bitten. Of course it's not because "God was with them" rather it's because the "Pet Rattlesnake" just didn't want to bite.
Of course anybody who has ever kept a pet snake (of any kind) knows that sometimes even a docile friendly Corn Snake will bite, and so sometimes a Pet Rattlesnake will too.
If the pet corn snake bites it's al alcohol swab and a bandaid but if your Rattlesnake at church bites you, it's a trip to the hospital, and even the possibility of death.
So........ I believe it is probably possible to keep and house a Poisonous snake, and never have any consequences from it, but it only takes that one time and for that reason I will stick to Boas and Corn Snakes.