Imagine the police knocking down your front door and accusing you of trading in child pornography.

It could happen, even if you're innocent.

Here in Wisconsin perverts have actually been arrested after trolling for child porn on unsecured internet connections. And you won't believe who one of those men is.

Anthony Miller is charged with trading hundreds of child pornography pictures, some of girls as young as nine years old, engaged in sex acts.

Cops say Miller did it all from a laptop computer as he cruised western Wisconsin streets using open internet connections in unsuspecting neighborhoods.

Eric Szatkowski is the guy who busted Miller. "Predators will use access to people's unencrypted wireless to have access to these horrific images."

And you won't believe what else investigators discovered. Anthony Miller is a police officer in the small town of Hastings, Minnesota. And he's accused of trading the child porn from his squad car while he was on duty.

JB Van Hollen is the Wisconsin Attorney General. "Very disturbing because law enforcement are the ones these people are supposed to rely on to protect their children; not victimize their children."

Miller is now awaiting trial.

John Mercure and the I TEAM went to his St. Croix County home to confront him ourselves.

Miller wasn't home.

Anthony Miller isn't the only Wisconsin pervert trolling for child porn through open internet connections.

Paul Doucet is facing 40 child porn charges. Cops say they found 3500 child porn images on his computer, some of kids as young as seven years old.

The criminal complaint says Doucet would drive around neighborhoods and locate unprotected wireless internet signals from unwitting citizens. It says he would park and download child porn. People in nearby houses had no idea that Doucet was using them for his alleged illegal activity.

Szatkowski told us, "You don't want the neighbor or a thug or a pervert or a predator driving in your neighborhood, parking in your driveway or outside you house with his laptop and accessing inappropriate, disturbing, maybe even criminal sites and having that traced back to your house."

On a recent evening Szatkowski took us out and showed us just how prevalent and problematic open internet connections are in our area. "You just park here. You access that unencrypted wireless signal. You're out on the internet and you can do whatever you want," he told us from the front seat of his truck.

We drove 50 feet in a neighborhood and three more open connections popped up.

John Mercure: "This would be like a gold mine for somebody who had bad intentions."

Eric Szatkowski: "Exactly."

The open connections showed up on street after street.

Eric Szatkowski: "Approximately half of the signals in this neighborhood are unencrypted."

John Mercure: "So half of them have an invitation for someone to come in here and do or look at whatever they want."

Eric Szatkowski: "Absolutely."

"You wouldn't go to sleep at night leaving your doors unlocked. Anybody could come walk through your house and take advantage of you or take your property. Don't leave your internet signal unlocked as well," Szatkowski told us.

Your unprotected internet could lead to a very unpleasant surprise.

"I don't think these people want us knocking on their door with a search warrant looking for child pornography on their computer when they have no basis to be a suspect," Van Hollen says.

The best advice is lock up your computer or risk getting locked up yourself.

Here are some basic instructions how to password protect you wireless internet

1. Be sure that your computer is connected and has internet. The next step is to enter your routers set-up page. You can get to your routers set up page through your internet browser by entering its address in the address bar. So what my router address? Your routers address depends on the manufacture. But typically with be like this 192.168.1.1 . Depending on your manufacturer the last two digits will change. This is where your manual will be helpful. If you do not have your manual, Google the brand and model of your router and you should find the address with your manufactures info. You may also find the address by going into your network connection in windows. Simply right click your internet connection in your network connection window and click status. Then click the support tab. The address for your router will be the numbers after default gateway.

2. After typing in your routers address in the address bar you may be asked to login. When you have entered your routers address in the address bar hit enter. Your browser will either take you to the main setup page for your router or ask you for a login and password. If you are asked for a login and password again refer to your manufacturers manual or web site. Generally it's some combination of "admin" for login and password or "admin" for login and no password. Sometimes even "password" for the password. This should take you to Your routers setup screen. Find your wireless security settings. Now find your wireless security tab. Every router is different. It may take some clicking around to find it.

3. Once you found your wireless security settings you will notice that they are disabled. You should have several options when it comes to the type of security that you can choose. Many experts prefer WPA, it allows you to simply enter a password to access your wireless network. This password can of course be saved in your wireless settings so there is no need to enter it but one time.

4. Simply enter your password in the password box and hit save. Your wireless network is now secure. Distribute the password to anyone that is allowed access to your wireless network.