Is it important or useful to a investigator to use word association test in interviewing subject person? and why?

Public Safety Officer must have to understand the deeper meaning of the General Principles of Crime Investigation for his/her knowledge on this particular subject matter will help him/her in performing his/her investigative duties and responsibilities. Basically, Public Safety Officers in the performance of their duties, they must seek to establish the six (6) cardinal points of investigation namely; WHAT, WHERE, WHY, WHEN, WHO and HOW.

Yes it is, if you know how to use the techniques of word association test you can get the true information/answer and make the subject person being interviewed tells no lies