Pest control is a licensed trade, not a man with a spray can
On top of the federal layer, each emirate's municipality licenses the companies themselves. A legitimate operator holds a trade licence with a public health pest control activity listed on it, a separate municipality permit for pest control operations, and individual approval cards for its technicians, who must pass municipality-run training on safe handling, dosing and storage. A cleaning company that offers to 'spray for cockroaches' as a side service, without that activity on its licence, is operating illegally even if the chemical it uses is approved.
This matters because pesticides are dose-dependent poisons. The same active ingredient that is safe at label concentration in the hands of a trained technician becomes dangerous when an unlicensed worker doubles the mix to make the treatment 'stronger'. The licensing system exists to keep untrained hands away from concentrates, and every shortcut around it transfers risk directly onto your household.