[latexr]

That’s just throwing more probabilities at the problem, and it doesn’t even solve it. You don’t need horrible nerve agents to kill someone by ingestion, it could simply be something the eater has a sufficiently nasty allergy to. And again, replicators aren’t limited to food.

The better idea is the simplest one: Don’t replace the perfectly functioning replicators.

[Out_of_Characte]

>That’s just throwing more probabilities at the problem

Think about protein folding and enzymes. That's all solved with probabilities and likely outcomes for the structure and the effect it has. Any replicator would already need to prove the things it is allowed to create, adding the items that it is not allowed to create is probaly needed as a safety protocol anyway.