that's up to each conference and is generally not prohibited. the american, for example, follows pretty much the ncaa transfer rules.
see the bottom of page 2 from usf's compliance office itself: http://www.gousfbulls.com/pdf9/2738595.pdf?DB_OEM_ID=7700
It says if he transfers from one AAC school to another he will lose a year of eligibility. Does that not apply since he is enrolled in JUCO now?