According to an article in De Pers, Dutch police intelligence services attempt to recruit minors to serve as informers. In at least some cases, this was even done without their parents knowing. A lawyer quoted in the article spoke of “stasi-like methods”, which sounds about right to me.
In the Netherlands only the socalled CIE or Criminal Intelligence Unit is allowed to use informers, with information gathered through their use not legal to use in criminal prosecutions, though some lawyers do complain that such information does end up in public prosecutor files and is hard to check up on. Rules about the use of minors are non-existent, so the situation seems rife for abuse. Certainly any such approach of a minor should be done with the permission of their parents. Sneaking around behind their backs is just wrong.