There’s lots of research with police officers that shows they don’t have more bias than non-police officers do at the implicit level. What is different with police officers is the situations they find themselves in, which require lightning-fast decisions and actions – and the force, both legal and physical, that they are equipped with.
I think one of the biggest concerns is that implicit bias training might lead people to feel exonerated from biased behaviour, if it stops at implying that bias is beyond their control.
We don’t have any evidence that anti-bias trainings work (in general,) and we know even less about whether they work for police officers
You can have the best training in the world but at the end of the day it comes down to morals, it comes down to the culture of an organization, it comes down to what’s tolerated.