Asbestos Testing Requirements

[Nadeim M.]

What is my responsibility to test for asbestos if tenant has concern? Backstory, I had to remove a a small section of drywall in restroom because wall adjacent to bathtub was wet. Tenant saw what they described as small grains of gray sand that he thinks is vermiculite when the drywall was cut out.  This has lead him to believe she has been exposed to asbestos. To address his fears/worries, I brought in a remediation company to run HEPA filters and wipe down horizontal surfaces. Am I still obligated to test, and if it comes back positive, what is my responsibility? Additional info, wall was repaired and I live in Los Angeles.