MIAMI — Drivers at drunken-driving checkpoints don’t have to speak to police or even roll down their windows. They just have to place their license and registration on the glass, along with a note saying they have no comment, won’t permit a search and want a lawyer.

At least, that’s the view of a South Florida attorney.

Warren Redlich contends the commonly used checkpoints violate drivers’ constitutional rights. He and an associate have created a website detailing their tactics. They’ve even made videos, one viewed more than 2 million times on the Internet, of their refusals to interact with police.

Doubts over the legality – and wisdom – of the tactics have been expressed by legal experts and local authorities.

Redlich, of Boca Raton, said his goal is not to protect drunken drivers, but to protect the innocent. He says some of his clients who passed breath-alcohol tests still faced DUI charges because the officer said he detected an odor of alcohol or the person had slurred speech.

“The point of the card is, you are affirmatively asserting your rights without having to speak to the police and without opening your window,” he said.

Not surprisingly, this does not sit well with law enforcement officials who insist drivers must speak in order to make the checkpoints work. And, they point out, the U.S. Supreme Court in 1990 upheld the use of random DUI checkpoints, concluding they don’t violate constitutional protections against unreasonable search and seizure.

“They wouldn’t be allowed out of that checkpoint until they talk to us. We have a legitimate right to do it,” said Sheriff David Shoar of St. Johns County, president of the Florida Sheriffs Association. “If I was out there, I wouldn’t wave them through. I want to talk to that person more now.”

The widely viewed video was shot Dec. 31 at a checkpoint in Levy County, Florida, by Redlich’s associate, Jeff Gray. In it, Gray approaches the officers with the flier, his license, registration and insurance card in a plastic bag dangling outside the slightly open car window. The officers briefly examine it with a flashlight and then allow him to continue.

In bold type, the flier states: “I remain silent. No searches. I want my lawyer.”

Legal experts said it’s unclear whether Redlich’s tactics will hold up in court. David S. Weinstein, a former Miami state and federal prosecutor now in private practice, said most states consider driving a privilege and drivers give up some rights.

“You may have to roll your window down and interact” with officers, Weinstein said. “These guys are all pushing the envelope.”

Redlich, however, said that to his knowledge, his fliers have been successful every time they have been used. His goal is not to challenge or confront police, he said.

“I’m not anti-cop. I’m anti-bad government and anti-bad cop. I support good cops,” he said. “I would like if police didn’t waste their time with something like checkpoints and would focus their attention on violent crime.”