The woman who stuck pins, needles and nails in food at a Calgary Co-op has lost her appeal.
In early 2010, the sharp objects were found in food for sale on four occasions at the Oakridge Co-op.
The Calgary mother was originally arrested for shoplifting from the same store a few months earlier.
Granada appealed the mischief charges, arguing the trial judge had erred when considering expert testimony.
A three-member appeal panel of judges dismissed that argument.
Granada will remain in custody until she finishes serving her three-year sentence.