loss prevention.

loss

a situation in which you no longer have something or have less of something, or the process that causes this:

a situation in which a business or an organization spends more money than it earns, or loses money in another way

 

(Definition of “loss” from the Cambridge Business English Dictionary © Cambridge University Press)

 

prevention

the act of stopping something from happening or of stopping someone from doing something

 

(Definition of “prevention” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)