I despise how the FBI swoop immediately in...take over...then seem to cover everything up.
Actually, if the FBI is doing its job correctly, the investigation will be very quiet. We have been conditioned over the last 8-16 years that the FBI does not do its job correctly.
Having said that, I will need to see thorough, complete police work to put together a definitive time line, list of accomplices, etc. at the end of the investigation process to believe this is not a cover-up.