Profile for Police
Finance: In the US - low finance - in some countries more
Time and Effort: As long as it takes to catch the bad guy - often limited on any given case.
Group Size: 1-5,000 person police departments
Other resources: Subpoenas, court orders, guns, SWAT teams, talented experts, lawyers, small arms, forensic analysis systems, in important cases the full force of the legal system may be brought to bear - and not all legal systems are like the US legal system.