The San Mateo County district attorney’s office will not file criminal charges against Sonnenschein Nath & Rosenthal partner Paul Glad over a March auto accident in Burlingame, Calif., that resulted in a mother losing a leg.

Glad told police he had taken one OxyContin pill that morning, and a urine test was positive for the painkiller. However, Deputy DA Sean Gallagher said Glad passed a field sobriety test shortly following the 3 p.m. accident, so there was insufficient evidence that Glad was impaired.