I won't say that a career as a CPIB officer will not provide you with useful experience but prospective employers might not take it as useful/relevant for another job especially in the private sector due to the competencies gained as a CPIB officer being different in nature. However if you are moving from CPIB to another civil or public agency, they will recognize the work experience from CPIB if you are selected though they have the discretion to choose to recognize the experience in full or otherwise.