SPOKANE, Wash. -

A man is free after being charged with exposing himself to women and children in Spokane and it's all due to a simple mistake prosecutors made during his trial.

Witnesses testified that 46-year-old Mikhail Karpov was touching himself in public at least four times over the past year, but that wasn't enough to get a conviction.

Prosecutors simply did not ask if the indecent exposures happened in Spokane County. That may sound like just a technicality, but establishing the location of the crime is a basic requirement in a case like this.

"I was scared after that all happened," says Hannalora Baldwin.

Last December, Baldwin was waiting at a bus stop in Spokane when she noticed Karpov driving around in a circle three times.

"After the last time I'd seen him, that's when I noticed he was masturbating," says Baldwin, "I was on the phone with my best friend and I told her it was really creeping me out ."

In another incident, two girls were walking to Broadway Elementary School when they saw Karpov parked in a Toyota Camry masturbating, according to investigators.

In all, Karpov faced five indecent exposure charges, but those charges were dismissed because prosecutors failed to establish that the crimes occured in Spokane County.

"It's sad that this individual was able to get off on such a technicality," says Spokane County Sheriff Ozzie Knezovich.

"I'm angry that I had to go in and testify and see this man and for him to just get away with absolutely nothing," says Baldwin.

"I'm not happy about this and I understand the prosecutors angst and hopefully Larry Haskell gets an appeal," says Sheriff Knezovich.

Judge Vance Peterson says the charges cannot be refiled.