More British Columbians have come forward to complain about the RCMP's tactics to secure the 2010 Olympic Games.

They're concerned that officers are knocking on the doors of people -- not because of something they did, but because of who they know.

Greg Hamilton says two plainclothes RCMP officers showed up at his door a few weeks ago.

"I was alone with my two children," he said. "They wanted to ask me questions: who I knew, what I knew, what my plans were."

Two years ago, Hamilton shot a documentary called "Five Ring Circus," about the financial, social and environmental costs to the region from hosting the Games.

Hamilton said he told the officers it wasn't a good time, and they left. They haven't been back in touch.

CTV News has spoken with a total of four people who say they've been approached by police about Olympic security.

None of them has plans to protest the Games.

The others are Langara College student Danika Surm, an activist's ex-wife, and another activist's roommate.

Last summer, the Integrated Security Unit acknowledged officers had approached more than a dozen people to ask about threats during the Games. But Olympic opponents say in the past few weeks the net's become much wider.

Andre Gerolymatos, a security expert and SFU professor, said he thinks police are simply engaged in "good old detective work" and sometimes that involves "clutching at straws."

"The fear for the police and security authorities is they're waiting for something to happen, and hoping it won't happen," he said.

Critics say the police tactics could chill free speech.

"I'm concerned this tactic might be sending a message to people not to associate with Olympic activism because if you do you'll be visited by a police officer," said David Eby of the B.C. Civil Liberties Association.

B.C. Solicitor General Kash Heed stands by the police actions.

"It's incumbent on them to check out each and every lead or piece of intelligence to ensure they have safe and secure games in B.C."

Hamilton said his police encounter is both laughable - and scary. He said he has no plans to stop making films.

In fact, he might have something else to make a movie about.

With a report from CTV British Columbia's Jon Woodward