Drop-Fails in Summer School

In California, a student cannot be drop-failed for non-attendence at a school. Does this rule also apply to summer school or can they dis-enroll a student if they miss three days to go out of state?

A cite would be helpful.

It depends on the district. Ours has a “miss 2 and you are out” policy for summer school, which they can do because summer classes are optional and at the districts whim.