Law enforcement buys breached data. How do they use it?

A few days ago I posted a link that law enforcement buys breached data from a company called SpyCloud. I didn't know if it was legit and you guys confirmed on this subreddit that Police do indeed buy data from breaches.

https://www.google.com/amp/s/www.vice.com/amp/en/article/3azvey/police-buying-hacked-data-spycloud My question is:

How do they use this data?

Do they use these breaches to physically log into suspects Accounts?

I find this to be very very unprofessional if that's what they use it for, because regardless of …

data law law enforcement privacy