A nanny toting a 1-year-old boy — and 14 pounds of marijuana — in a luxury SUV was busted as she delivered the drugs to a house in New York's upscale Westchester County, police said Tuesday.

Police acting on a tip watched Monday as Sanjay Rodriques, 24, dropped off the cardboard box, stuffed with a tightly wrapped bag of marijuana, in Dobbs Ferry (search), they said.

"It's incredible — you never know who you entrust your family with," said Westchester County Department of Public Safety Commissioner Thomas Belfiore (search). He said the parents "were horrified when they found this out."

"They said they had conducted over 40 interviews and done a background check before hiring this lady, and she had no criminal history," Belfiore went on. "They thought she was terrific and really good with the baby. They had no signs there was any trouble."

Police said the nanny's drug odyssey began at her employer's Landing Drive house at around 8 a.m., when the pot was dropped off on the home's front stoop. Later, she came out and allegedly brought it inside.

In the afternoon, Rodriques left the house with the baby and put him in a children's car seat in the rear of her employers' Acura MDX, then put the box of pot, worth about $30,000, in the passenger seat, cops said.

She drove to a home on Chestnut Ridge Way, where she put the box in the front seat of a Chevy minivan owned by the residence's 33-year-old housekeeper, Paula Bennett, cops said.

As Rodriques and Bennett briefly chatted outside, cops pounced and arrested them.

Rodriques, from the Bronx (search) borough of New York City, was charged with two felonies: marijuana possession and conspiracy. She also was hit with a child-endangerment rap. She was remanded to Dobbs Ferry jail, Belfiore said.

Bennett, of Mount Vernon, N.Y., was released on $500 bail on a conspiracy charge.