There are two levels of qualification you require to establish the legitimacy of certification.
The ICA is a multi-disciplinary association of academics, urban designers, police and security experts, researchers, community development specialists, private property owners and developers, consultants, and government officials. They commit themselves to the CPTED methodology as defined on the landing page of the ICA website. It is the only existing, international organization to provide professional CPTED status.
To create safer environments and improve the quality of life through the use of CPTED principles and strategies