SAN DIEGO (CBS 8) - A popular San Marcos animal hospital was raided by investigators Monday morning. 

Doctor Dorota Pearson has been running the Pearson Animal Hospital for more than a decade. 

Officials told CBS News 8 Monday's inspection was a follow-up to ensure the hospital regulations. 

The Consumer Affairs Department did not disclose why  they were originally called to the hospital prior to Monday's follow-up. 

Dr. Pearson did not respond to CBS News 8's request for comment. 

The DEA said it is assisting in the investigation, and will be looking a the hospital's controlled substance dispensing practices. The agency said it could not comment any further on the investigation. 

CBS News 8's Eric Kahnert has been on the scene all day and reports with the latest information.