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The safest way would be what NoOne said, except you should worm them as well. I think that if you worm mice you have to keep them alive for a while so that the worming chemicals are voided by the mice. Personally I don't think it is worth the bother.
The risks are ( low-level ) posioning and parasites. We try and keep reptiles way past thier natural use-by date, a diet including natural toxins may cut down the animals life span.
And many animals we keep are the ones that would be winnowed out in the wild, not alert enough, too clumsy or not tolerent enough to common toxins.
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