[thotpoizn]

The hypothetical "pedo gene" is probably too emotionally charged; some may find it difficult to engage rationally as a result.

Suppose instead there were a gene found which caused a toxic reaction in some children. Some, but not all, children exposed to these substances might sicken or even die.

I suspect that in such a scenario, if the evidence showing correlation was compelling - you would be OK with mandating testing, and separating children from contact with known carriers of the gene - at least until it could be better understood and/or treated, cured, the harm mitigated, or what have you.

I would further suggest that if YOU were discovered to be a carrier of the gene, that you yourself would probably feel an obligation to self-report and avoid any contact with children, so as to prevent any accidental exposure and harm.