Did San Diego bus drivers eat pot brownies?

(CBS/AP) SAN DIEGO - Officials say three San Diego County bus drivers who may have eaten marijuana-laced brownies acted properly by pulling off the road.

Metropolitan Transit System spokesman Rob Schupp says three drivers — not four, as previously reported — became ill Sunday while on their routes, possibly after eating pot-laced brownies distributed by another employee.

Replacement drivers were called in and the employees were placed on administrative leave and given drug tests.

CBS affiliate KFMB reports that the brownies were baked by an employee's roommate and the worker apparently didn't know they contained pot.

City News Service says the transit agency investigated and determined that all of the employees involved acted appropriately.

MTS chief Paul Jablonski says the drivers followed procedures to the letter and supervisors acted quickly to protect the public.

Schupp said charges or disciplinary action against any employee had not yet been determined, KFMB reports.