That's because conventional wisdom tells them that, since they don't know exactly what will be asked of them, it's impossible to prepare for the interview. This is false. If they took a few minutes a day before their interview, wrote down potential questions and answers they believed might be asked of them, and had someone act as a mock interviewer, they would do dramatically better. Why? Because practicing, even if they don't practice answering the exact questions they're eventually asked during the interview, is still more beneficial than not doing so at all.
This same principle applies to preparing for court testimony. For example, if you'll be testifying in a domestic violence case, the defense attorney will likely ask you some questions pertaining to domestic violence laws in your state, and why you thought they applied. They'll probably ask what specific training you've had in domestic violence. They'll likely focus on any injuries you reported the victim sustained—possibly to make it appear the injuries weren't fresh and weren't related to the incident you investigated. With some practice and planning, is it difficult to determine what questions will likely be asked of you before you go to court? Actually, it's not.
Defense attorneys aren't usually that unpredictable. The key is to stay a few steps ahead of them when testifying. That is done by practicing beforehand, and it can be done many ways. The most common is to work with an experienced officer and have him or her ask you hypothetical defense questions, based on your report. Don't spend hours doing this. A few minutes a day before you're scheduled to testify will be a huge help.
If you've never testified before or only have a few times, it's natural to be a little apprehensive. Just don't let some myths we've discussed throw you off. Remember to prepare by practicing your testimony. Also, regardless of how well you perform in court, remember that judges and juries make some astonishing decisions. Therefore, don't take it personally if your cases don't always have the outcome you had hoped. Like secretaries starting new lives as truckers, it happens.
Mike Grimes is a veteran police officer, author, and freelance writer now based in Indiana. His law enforcement experience has included Field Training Officer, background investigations, academy instructor, and evaluator. He is the author of two books one on budget travel and the other on time management, which are available on Amazon Kindle. He can be reached at mgrimes310@gmail.com.