There no diseased and they don't spread it to your snakes ...yes it may kill their collection, but its their risk, not yours.
They don't release these exotic species into the bush to infect other snakes aswell..they keep them in a tank...Border security is tight for absolutely no reason but to rip us all off and have us pay high taxes for **** 1/3 the price elsewhere.
There are lots of people out there who do get caught, and lots that don't... personally I think good on them for softening up Australia's ridiculous laws and just maybe someday...we'll get Milksnakes, Cornsnakes,pyeballs, some of the most intriguing COLOURFUL snakes... after all...they have all of our countries snakes