Merced County Office of Education

Drug and Alcohol Testing

For program questions or problems contact:

Preferred Alliance
16960 S. Harlan Road Building 2, Suite 2D
Lathrop, CA 95330-8738
Ph:  (800) 272-5227
Fax: (209) 858-5693

Problems with testing, positive test results, MRO questions, or serious problems call:
Manny Chavez, General Manager
Nanette Mendez-Latalladi, Customer Service
Sylvia Martin, Customer Service
Michelle Vincent, Customer Service and Billing
Susana Esquivez, Customer Service


​​For Updates or changes to personnel lists, please send a fax to (209) 858-2669 or email Support at

​​If there is ever a problem, no matter how big or small, Nanette Mendez-Latalladi should be notified.


​Directions for Maintaining Program