请帮我看下这篇托福阅读段落的主题是什么wheninvestigatiorsquestionapersonsuspectedofacrime,theylookforcluesthatsuspectmightbelying.Thetraditionalliedetectortest,thepolygraph,monitorspulseratesandbloodpressu

Question

请帮我看下这篇托福阅读段落的主题是什么when investigatiors question a person suspected of a crime,they look for clues that suspect might be lying. The traditional lie detector test,the polygraph,monitors pulse rates and blood pressure to provide some clues about whether or not a person is lying.However, these clues are not always accurrate,and the polygraph is considered to be too unreliable for use in most courtrooms. In the last decade,research in the field of lie detection has made great leaps forward,and experts now believe they have developed a practical ,useful,and,most importantly,accurate means of detecting lies.

Answer 1

improvement and development of lies detecting tech.