FED MINIMUM regulations.
Both Federal and State laws govern the employment of young workers and when both are applicable, the law with the stricter standard must be obeyed.
The Federal youth employment provisions do not:
require minors to obtain "working papers" or "work permits," though many States do;
restrict the number of hours or times of day that workers 16 years of age and older may be employed, though many States do;
apply where no FLSA employment relationship exists;
regulate or require such things as breaks, meal periods, or fringe benefits;
regulate such issues as discrimination, harassment, verbal or physical abuse, or morality, though other Federal and State laws may.

*** The regulations provide a limited exemption from HOs 5, 8, 10, 12, 14, 16 and 17 for apprentices and student-learners who are at least 16 years of age and enrolled in approved programs.

http://www.dol.gov/whd/regs/compliance/whdfs43.htm