I personally don't use newspaper but this argument against it kind of seems pointless. You can say the same thing about any substrate used. It all comes into human contact and can be contaminated the exact same way. The person bagging your substrate could have the flu, may not have washed their hands, a pest may have come in contact with it, may have gotten wet, mold spores could be attached. There are infinite ways anything can be contaminated and there is no prevention with any substrate. People choose what is best for them and their situation and I and many others don't see what the issue is. Quarantine, husbandry, and sanitation are things you can control and should be in order to protect your animals mostly from each other or outside sources. There are very few communicable diseases between human and reptiles. What you rely need to worry about is transferring from reptile to reptile hence the strict rules of quarantine for new animals.
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