Can someone answer me this? How does the BSA get the right to enter a business? I am not trying to be facetious I do not understand this part of the law where a

Can someone answer me this? How does the BSA get the right to enter a business? I am not trying to be facetious I do not understand this part of the law where a private entity gets the right to enter another private entities establishment. I can understand officials like the police but by what virtue can they (a private entity) compel you to allow them entry. I assume that it has something to do with licensing terms but what if you have not purchased any BSA licensed software?