Are police jammers legal?

The use of jammers is illegal for private individuals and may be used by the police/government. But: can she do this under any circumstances? For example, in Switzerland, government use of jammers (systems) requires approval (see

Topsignaljammer  2022.3

I know that the use of signal jammer in many public places requires judicial decisions. This is due to the use of licensed and paid radio channels that have been "rented".