Sniff Dogs, a New Jersey-based company founded by two concerned mothers, offers a "discreet" service in which Labradors and Alsatians trained to search airports and nightclubs are set loose in the arguably more challenging terrain of a teenager's bedroom.
For $200 (£125) an hour, the dog and its handler can sniff out heroin, cocaine, crystal meth and ecstasy. The company says that the dogs' sensitivity to marijuana is so acute that they smell the seeds from up to 15 feet away and detect the drug's residue on clothing even two days after use.
The dogs are trained to sit when they detect drugs, leaving parents to conduct the final stage of the hunt.
The company's founders say sniffer dogs avoid the confrontation that comes from a drugs test as the search can take place without children knowing.
The company has five dogs and currently only operates in New Jersey and Ohio, although it wants to expand across the US.
Debra Holmes, Sniff Dogs' co-founder, rejected accusations that her recently launched service was invasive and could break down trust within families.
"Parents think it's about cops busting into the house, as on TV, but it's not much different to a termite inspection," she said. "It's often a five-minute process as these dogs are so quick."
Mrs Holmes had the idea after – much to her surprise - her teenage son was caught driving under the influence of marijuana.
She cited statistics showing that half of American high school pupils have tried marijuana and that most teenage drug-taking happens in the afternoon when they get home from school.
She said she had received an enthusiastic response from parents as well as drugs advisers.
"Drug prevention should begin at home but there's been no way for parents to implement it," she said.
By Tom Leonard in New York
Last Updated: 5:45PM BST 23 Oct 2008