[deadlyllama]

Would this work:

* put a warning wrap on your sandwich - danger - this sandwich may have laxatives added

* if your sandwiches continue to go missing, label them AND add laxatives

[banannaise]

well then you're specifically poisoning people who can't read English.

Legally, there's really not a way around it besides simply not doing that.

[dheera]

What if you needed the laxatives, medically?