If they seriously believed in their polygraphs, they would use them equally; meaning they would use them on alleged victims as well. Alas, they do not and the reason for that is, if it were true that a machine could read someone’s mind, they would be using the machine to further a conviction as they often do with “eye-witnesses” (not that they are much more reliable than a polygraph machine). The polygraph test results of a victim would be used as proof that the victim was not lying, however, the test results of neither are allowed in the court room.
The polygraph machine was already proven to be complete and utter garbage. The creator of the machine even admitted that the machine could not determine “truthfulness”. The machine was tested on a common house plant and actually gave a result??? This is pure snake oil sales and needs to be discontinued – period!