Plans to deal with men from Mars.
It's a bit of a long story, but in the 90's, I got a look at a very similar plan. Like many government endeavors, it was wrong-headed and unintentionally hilarious.
"Nobody is going to take them" isn't an outright falsehood, but it is a craven evasion. Door-to-door confiscation would be inconsistent, inefficient, and possibly hazardous. A better idea is to simply pass a ban, then arrest people individually when they're found with the verboten item.
It's like saying "I'm not going to poke you with this stick" while I demand that you hand over your wallet.