A sheriff from Lake County, Florida, has released an amazing video to send a message to both drug dealers and concerned residents.

Flanked by masked undercover detectives, Lake County sheriff Peyton Grinnell delivers his hardline message over a background of intense music.

"To the dealers that are pushing this poison, I have a message for you: We're coming for you," Grinnell tells the camera.

"As a matter of fact, our undercover agents have already bought heroin from many of you. We are simply awaiting the arrest warrants to be finalised."

The video was posted to Facebook by the recently-formed Community Engagement Unit.

The unit has received numerous phone calls from concerned residents about the rise in heroin overdoses.

"Enjoy trying to sleep tonight, wondering if tonight's the night our Swat team blows your front door off the hinges," Peyton says in the video.

"If our agents can show the nexus between you the pusher of poison and the person that overdoses and dies, we will charge you with murder. We are coming for you. Run."

Some have applauded the sheriff's hardline approach, but many others have criticised the over-the-top video – particularly the use of balaclava-clad, armed agents.

Lake County Sheriff's Office
Many have criticised the use of balaclava-clad agents Lake County Sheriff's Office