FABB published the report on last August's fatal bicycle crash in Herndon, with their comments. I didn't realize it then, but the driver was an Uber driver.
While it does appear that they cyclist failed to have a tail light when required by law (and maybe no rear reflector either), it also seems the police are citing numerous other factors against the cyclist that are dubious in nature. They cite distracted cycling, which might make for an interest discussion, had the cyclist not been hit from behind - normally not the kind of crash that can be prevented with attention. They also point to riding abreast, not wearing a helmet and lack of reflective clothing/tape. Greater visibility might have helped, but those things aren't required by law. Helmets, at best, would only mitigate the damage of the crash. And FABB points out that riding abreast does not apply to this situation where there were other lanes they could be passed in.
Also, the driver has a less than stellar driving record.