Why 3 months of quarantine?

[CoolioTiffany]

But you could have waited 3 months and mabey there was still a parasite in it and then all your other snakes got it.

Normally you will find out it has parasites during quarantine. When they have parasites, you will notice their feces is more runny and doesn't look normal and will have a fowl smell. You will sometimes see parasites swimming in water dishes as well, but I'm not sure what types of parasites are large enough to physically see.