BEAR, Del. -- A Delaware woman and her son were in police custody Saturday after authorities found a cache of drugs and guns in their home following the recovery of a drug-filled package the woman tried to mail.

Residents of Bear, Del., told WTXF-TV they were stunned to learn that 63-year-old Marilyn Howell and her 32-year-old son Robert Howell had been arrested.

Investigators went to the Howells' house after they tracked a package containing methadone, Ritalin, Soma, Xanax and hallucinogenic mushrooms to Marilyn Howell.

Police said she had intended to send the package to her daughter in Colorado, but the parcel was returned because the postage had not been paid for properly at a self-serve kiosk.

Detectives found the substances wrapped in dryer sheets, bubble wrap and a perfume-doused T-shirt.

A search warrant was executed for Marilyn Howell's home on Feb. 24, and police found marijuana and psilocybin mushrooms, as well as drug paraphernalia including pipes, scales, grinders and packaging materials.

Five firearms were recovered from inside the home, including a 9mm handgun and a modified AK-47 rifle.

Marilyn Howell was taken into custody and charged with multiple counts of possession with intent to deliver a controlled substance and possession of a firearm by a person prohibited, among other related charges.

Robert Howell was charged with possessing a destructive weapon and possession of drug paraphernalia.

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