Unfortunately, schools are free to set their own policies regarding CLEP, DSSTs, and other credit-by-exam programs. You just have to learn the school policies and work with them.
That being said, how about suggesting an alternative to the school for future students. Instead of eliminating CLEPs altogether, suggest they make a policy that credit for CLEPs will only be given for exams that are completed before the first full-term of enrollment. This would be identical to the University of Florida policy.
Office of the University Registrar
Office of the University Registrar