Some parents teach their kids how to ride a bike or tie their shoelaces. Jessica Lynn Riffey taught hers how to inject heroin, police said.

Chester County District Attorney Thomas P. Hogan said Riffey, 34, of the Honey Brook section of West Caln Township in Chester County, showed her 14-year-old daughter and a 16-year-old boy how to tie a string around their arms to get their veins to bulge and then how to use a hypodermic needle to inject the drug. Riffey's boyfriend also gave the teens heroin to snort, Hogan said.

Riffey now is behind bars on $50,000 cash bail, charged with corruption of minors, endangering the welfare of children, drug delivery and related offenses.

"Supplying anyone with heroin is a potential death sentence," Hogan said. "Injecting children, including your own daughter, with heroin demonstrates a depravity that defies belief."

Police discovered the scheme last Thursday, when they were called to Riffey's home for a well-being check, according to an affidavit. The teens told police Riffey injected them with heroin several times last month.

During questioning last Thursday, Riffey admitted she injected the teens with heroin one to three times in her bedroom between July and September, according to the affidavit.

Jameson Burn, Riffey's boyfriend, has been separately charged with drug dealing and related crimes, Hogan added.