It's a very good question. In Poland police was also said to have used this device during an oppositions protest. However, it turned out it was used as a speake

It's a very good question. In Poland police was also said to have used this device during an oppositions protest. However, it turned out it was used as a speaker. It wasn't used as a crowd control device because it isn't included in our Law about Police as a legal mean of enforcement. To make things more interesting it shouldn't have been bought at all (because it's usage is illegal), but it was bought anyway by our previous government that is our current opposition protesting today.