A baby-faced 15-year-old boy, described as a “Mr Big” in the Perth drug scene, has been arrested after allegedly trying to sell a dealer $100,000 worth of methamphetamine.

The age of the boy, and his position so far up the drug supply food chain, has stunned the officers who arrested him over the weekend in the Wheatbelt town of Northam.

“I would have to say that we were shocked that a 15-year-old has got access to these quantities of drugs and has the capability of then dealing them to others,” Detective Senior Sergeant Mitch Howard of the Wheatbelt detectives office told the West Australian.

“My staff had to convince me that they really had the right target. From all my 30 years of policing experience ... I have never come across that before.”

Wheatbelt Detectives with some of the methamphetamine seized during their recent drug raids.

Police were targeting a 31-year-old woman who was recorded speaking on the phone with the teenager and agreeing to buy 100g of meth, worth more than $100,000, in three separate deals.

Police arrested the woman after pulling her over and allegedly finding close to $45,000 worth of methamphetamine in her car.

Officers then traced the boy to a house in Wanneroo where he was allegedly found with 30g of meth and 30g of ecstasy, reportedly hidden in his underpants.

The boy has been charged with two counts of conspiring to sell a prohibited drug, one count of selling a prohibited drug and two counts of possessing a prohibited drug with intent to sell or supply.

He faced Perth Children’s Court yesterday and was granted bail.

The shocked boy’s parents were at the courthouse after only learning the day before what their son had allegedly been up to, the West Australian reports.