Original sentence: John Douglas pioneered "criminal profiling"; at the time of criminal profiling's conception Douglas was doubted and criticized by his own colleagues until both police and the FBI realized that Douglas had developed one of the best tools used to this day to capture criminals.The polygraph and then DNA testing had many supporters; however the polygraph has been proven to be inaccurate, and even DNA testing doesn’t always catch a criminal
Edited sentence: John Douglas pioneered "criminal profiling", at the time of criminal profiling conception, Douglas was doubted and criticized by his own colleagues until, both police and the FBI realized that Douglas was right, and had developed one of the best tools used to this day to capture criminals.Many years of psychology and taking classes within law enforcement are needed.The polygraph and then DNA testing had many supporters; however the polygraph has been proven to be inaccurate, and even DNA testing doesn’t always catch a criminal, but criminal profiling is timeless and is something that cannot be learned on one's own