Would you sniff your kids?

Sniff Dogs rents drug-sniffing canines to parents for $200 an hour. It was started this year by Debra Stone, who says her five trained dogs can detect heroin, cocaine, crystal meth and ecstasy.

The dogs' noses are so sensitive that they can smell a marijuana seed from up to 15 feet away and marijuana residue on clothing from drugs smoked two nights before.

One of the selling points of this service? Avoiding the kind of confrontation that comes with a drug test.

Drug-sniffing dogs aren't the only measures parents are using to keep tabs on their children. There are now Global Positioning System devices that can be sewn into children's clothing to monitor how fast they're driving, and software that allows a parent to read text messages.

But some psychologists say these surveillance techniques can backfire.

"There are major repercussions for this type of intervention," said Dr. Neil Bernstein, a Washington, D.C.-based clinical psychologist and author of the book "How to Keep Your Teenager Out of Trouble and What to Do if You Can't ."

Source: abc