Well the information is out there so any discussion this far down the line usually assumes you know the facts.
The 'drug connection' was based on out of date information, given she had cut all ties with that suspect.
The problems people have with the case are procedural and the police shot multiple rounds into the apartment blindly, killing her, which is against policy. They are supposed to have a clear line of sight to who they are shooting at.
For some reason they sent the stand-by ambulance away an hour before the raid which is also against procedure and medical attention only arrived after the boyfriend called 911. It's unlikely she could have been saved in any case for to the severity of her injuries.
There was also the question of whether they announced they were police and they have changed that to now outlaw 'no-knock' entries in Louisville.