HONOLULU (AP) — Honolulu police have urged lawmakers to preserve an exemption in Hawaii law that lets undercover officers have sex with prostitutes during investigations. But they won't say how often — or even if — they use the provision.

The notion has shocked advocates and law enforcement experts on the sex trade.

"I don't know of any state or federal law that allows any law enforcement officer undercover to ... do what this law is allowing," said Roger Young, a retired FBI agent who worked sex crimes out of Las Vegas for more than 20 years and has trained vice squads around the country. "Once we agree on the price and the sex act, that's all that you need. That breaks the law."

This year, state legislators moved to revamp Hawaii's decades-old law against prostitution. They toughened penalties against pimps and those who use prostitutes. They also proposed scrapping the sex exemption for officers on duty.

But Honolulu police said they need the legal protection to catch lawbreakers in the act. Otherwise, they argued, prostitutes would insist on sex to identify undercover officers. The legislation was amended to restore the protection and the revised proposal passed the House and is now before the Senate.

But on Friday, lawmakers said they again planned plan to change the bill — but this time to end the police exemption.

The Senate Judiciary Committee heard testimony from citizens, advocates and lawyers who argued against the exemption.

No police testified Friday. Committee Chairman Clayton Hee called the exemption nonsensical and said he would amend the bill to end it.

The Honolulu police vice officers who investigate prostitution haven't been accused of sexual wrongdoing in recent memory, spokeswoman Michelle Yu said in an email.

In recent testimony, Honolulu police assured lawmakers that departmental policies are in place to prevent officers from taking advantage of the sex exemption. But they wouldn't detail those policies.

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"If prostitution suspects, pimps and other people are privy to that information, they're going to know exactly how far the undercover officer can and cannot go," Maj. Jerry Inouye testified.

Advocates warn that the provision is an invitation for misconduct.

Melissa Farley, executive director of the San Francisco-based group Prostitution Research and Education, said prostitutes commonly complain of being coerced into giving sexual favors to police to keep from getting arrested.

Having sex with a prostitute during an undercover operation "doesn't help your case, and at worst you further traumatize someone," said Derek Marsh, who trains California police on human trafficking.

Charlie Fuller, executive director of the International Association of Undercover Officers, laughed when he heard about the Hawaii law.

"A good undercover is going to get probable cause before they have to cross that line," he said.

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Associated Press reporter Nicholas Riccardi in Denver contributed to this report. Sam Eifling can be reached on Twitter at http://twitter.com/sameifling