After two packages were stolen from a Missouri family's porch in less than a week, they decided enough was enough.

The family from Hazelwood, a St. Louis suburb, had security footage that showed the same thief was coming to their porch and stealing packages they had ordered online, the mother, who asked not to be named, told NBC St. Louis affiliate KSDK.

"I felt violated. It's not a good feeling,” the mother said of the thefts. "The best way to deal with things is to have a good sense of humor about it.”

She also said she wanted revenge.

The family decided to plant a package on their porch for the thief to steal.

"We put two dirty diapers in there, flipped them inside out, put them in the Amazon package, sealed them up, put them in the door," the mother said.

A day later, the thief returned, and took the package full of feces. "She got the special surprise from my daughter,” the mom said, calling it “some sort of justice.”

The family also turned the surveillance footage over to local police, who arrested a female suspect Sunday. The alleged thief, who is not being identified, has existing felony warrants, police said.

“We do not particularly encourage the transfer of bodily fluids," a Hazelwood police spokesperson said of the dirty-diaper ruse.

As online shopping grows, authorities recommend customers worried about package theft have things shipped to their workplaces or ask that the carrier place the package in an area out of plain view.