Young officers are like young puppies; they yip and yap and want to chase cars. They are not our pets and we do not yell at and kick at our puppies, so why do this to recruits? One golden rule I follow that you should also abide by is that if I raise my voice at you, you'd better seek cover. That's because such a reaction is reserved only for a critical life threatening moment. As a rule, you do not yell at recruits as an FTO.
Recruits love praise and do not want to be scolded. Therefore, praise in public and chastise in private. You want the recruit to excel? Then praise him or her in front of fellow recruits. Praise will keep them excelling when most would stop. After all, you like to be appreciated as well. Never, ever chastise a recruit in public unless it is a life critical moment. Some of the worst tail chewings I ever received were at a low voice, and the disappointment of my supervisor was in every word. You do not have to yell to be heard.
Reminders need to be realistic. For example, "If you do this you will lose the case or the evidence will be tossed out in court." Far too many FTOs use the ever familiar "if you do this you will get killed" phrase. This to me is overused and lost its punch years ago. Not everything we do or don't do will get you killed. Back in my academy, everything we did was getting us killed; we did not expect to live to graduation. Give realistic offerings of what could happen, not the same doomsday chronicles.
Mentoring 101
Oftentimes the FTO must be more than a trainer. I recall one recruit I had that was new in town. He did not yet have a bank in the area and didn't know where to find something as simple as the nearest grocery store. I had to be a mentor in this situation and guide him in the right direction. This did not make me his buddy.