You can stab people with almost anything. Toothbrush, piece of paper carefully folded, shoelaces melted into a soap mould... stopping one more thing getting in won't matter.

I think the idea was to make it easier to notice them, as parent suggested.

It is not hard to notice an RF transmitter. If the police thinks their size matters in any way, they completely missed the point.

so we should just give them knives since they will just find a way around not having one anyway?