Transcript for Behind the Badge: Confessions of a Cop
Reporter: The speed. The sound. The adrenalin rush. Nothing beats the excitement of a "code 3" the emergency response that allows cops to race through the streets with lights and sirens blaring. Oh, of course it's n. Reporter: From patrol cop to commanding a robbery squad, the highly decorated nypd detective seargent gerry kane has seen it all. Now retired, he has a little high speed confession. Reporter: Did you ever use the code 3 to go to lunch? Oh. Uh, I would rather take the fifth amendment on that, uh, jim. Reporter: But this miami cop in his patrol car took the license to speed to an extreme. He's off-duty yet driving up to 120 miles per hour on his way to a second job. A florida state trooper pulls him over. Put your hands out that window right now. Reporter: He's shocked when she cuffs him like any civilian suspect. Oh my god I cannot believe this, I cannot believe this at all. Reporter: He couldn't talk his way out of trouble, but kane says you might if you're pulled over. Here's his advice. First, realize the officer faces a serious risk. The most dangerous thing to the cop when he comes up to the car are the hands of someone because they could hold a weapon. Reporter: So kane says if you're pulled over by an officer, work to put him or her at ease. If he could see everybody's hands, immediately his blood pressure goes down, his pulse gets a bit slower. If it's nighttime, turn on the interior lights in your car. Night or day, lower all the windows on your car and put your hands up on the steering wheel high where the cop can see them. Reporter: So you want to make it easy on the officer? Absolutely. If you were gonna get some discretion, you now set up that possibility. Reporter: It's probably best to spare the officer your excuses. I'll tell you right now that every cop I know is just, assumes that everybody is lying all the time. Reporter: Kane says be apologetic, but don't feel you have to admit anything. You can play dumb. You can say, "what did I do?" And if he tells you what you did, you could say, "well, you know, I must have you know, i just didn't realize it." You don't have to surrender. Reporter: Does it work to cry? Only for women. Reporter: What if she shows a little leg? Since, since men and women were created, attractive women get more breaks. Reporter: Kane says ultimately he protects himself by keeping his speed less than 10 miles over the limit. If you were my brother or my cousin and asked me, that's what I would tell you. Reporter: As upset as you are about that pricey ticket, don't let your rage run wild and back into the squad car. He's just added reckless driving on top of the speeding ticket. But sometimes the rage comes from the other side of the badge. Here's an example in a minnesota detox center where a drunk and disorderly man in the wheelchair verbally threatens a social worker. The cop doesn't take it well. They get their life threatened it's very hard to sometimes control your temper, regardless of how much you have been trained, regardless of how much experience you have people make mistakes. Reporter BUT A ROGUE COP IN A Bad mood could arrest you for anything. That's what allegedly happened in this new jersey traffic stop where the driver had run off and left his passengers behind. There is no driver around. Driver's gone. Reporter: State trooper justin hopson knows that because he was there that night the officer on the right. His says his senior partner was and suddenly decides to cuff her for drunk driving even though he knows she wasn't behind the wheel. I want you to turn around and put your hands behind your back for me, you're going to be under arrest for dwi. Relax. No, no, no, no. Hands behind your back. He was being a cowboy and not a cop. He knew and said so. Reporter: How can abuse continue to exist? Hopson says he found out when stunned by the improper arrest he tells his partner that he won't back up the false story in court. He looks at me and he said, "you better keep your mouth shut." Reporter: As hopson writes in "breaking the blue wall," when he refused to lie on the stand, he was targeted by a rogue group of troopers who called themselves the lords of discipline. He sued and settled for $400,000 although the state denied wrongdoing. I was physically assaulted. I was ostracized. Hate notes left on my locker. Reporter: Kane insists that cases like hopson's are rare. Negative stereotypes of abusive, corrupt cops aren't the norm. Witness this photo, viral this week, of an nypd officer buying boots for a homeless man in new york. But in one final confession, he reveals that another stereotype is more than urban legend you know, the one about the love affair cops have with donuts? They'll give you a little sugar boost. Reporter: So it's not just a stereotype? It is a stereotype, jim. Reporter: But based on a little bit of fact. It's a little bit of fact.
This transcript has been automatically generated and may not be 100% accurate.