What keeps it valid is keeping emotions out of it. Tell the facts, tell what kind of driver they were for you, keep it honest, keep it simple, no emotions to cloud it. It can't be biased if you just tell the facts about someone the exact way it happened. For example, we had a driver out of Corbin, KY who wanted to drive our cargo van. He calls, we talk on and off for hours covering all the information I can possibly give him before he makes a final decision that he wants to drive for us. We set up a date and time for him to come do the paperwork, see the van, get it outfitted, and get on with our brokers. As the day approaches, I try to keep in contact with the driver making sure we're still on. The answers get fewer and further between. The date and time pass and I give up and go on to the next driver on my list. About a week after the fact, I finally hear from him and he tells me, sorry, I can see that you've been trying to get in touch with me, but my phone was stolen. Okay, there's the facts about what happened between me and that driver. Now that's not biased, that's just what happened. If I wanted to give a biased review, I would add to this that he told me "I see that you were trying to get in touch with me, but my phone was stolen and I had to get a different one." Really? My calls and texts would have not been able to be accessed from a new phone and new sim. Of course, I can go even further in playing devil's advocate and say, well, maybe he's like me and looks online at his phone records, and could see texts going through from me. However, I knew that his phone was a blow up phone that keeps no such records so it goes back to my biased account that I knew he was lying. OKAY.... so I don't share the last part, just the facts. If a company or fleet owner is smart enough to read between the lines and see the discrepancies, okay, but I didn't give them my opinion, only what happened. Now, that's how you keep it valid and unbiased. This isn't my first rodeo with dealing with human resource type issues. My first job right out of college was as a paralegal to a personal injury/employment attorney and learned early on how to handle something legally and professionally. No matter how much I want to share my opinion of someone, I am quite capable of just sharing the actual facts.