To the OP:
If you need the POST cert, make sure the course you take is 'POST approved' with a CA POST control number. Some courses may claim to be 'consistent with' or 'POST curriculum' but that is not the same if a dept requires a POST cert. Some instructors (maybe even POST certified themselves) may use material from a POST course and teach it on their own but that does not make for a certified course.
You can go to the CA POST website and look in the training section to confirm if a course/organization has a control number for that course.