No professional EMTs place their mouth on a patient’s mouth. CPR is done with compressions only by bystanders, no one is advised to place their mouth on another’s. A compression moves enough air into the lungs to provide for life, if it’s possible. An EMT would intubate and provide oxygen. This guy is silly.
The cops did mouth to mouth and compressions.
Besides, you can get sued if you try to 'help' and the 'patient' dies or is injured through your 'help'.