The justice system in streets of rogue are based on tiers, some citizens of the floor have more power to commit murder or assault. Lets begin with the classes with the most amount of power that is protected.

Crime immunity: The police officer, shopkeeper, drug den units, hospitals, and banks; have the highest policing power. If you were hit directly in front of a police officer by any of these units the police officers that witnessed the crime will instantly attack you. These classes are also immune to being arrested without incurring the innocence penalty so avoid directly killing them or arresting them if you are the police officer.

Crimes: Certain actions are treated as crimes and will give certain npcs guilty status, however npcs can still become criminals even without having the guilty status since only cops can see the guilty status. I will not be listing details of player unique crimes such as theft and arson.
Assault: The most important crime in order to farm exp, npcs have to hit another npc in order to become guilty of a crime excluding property owners which are automatically immune to criminal activities.

Police officers: One of the hardest classes to gain exp normally, however if done correctly is the one of the two classes that can reach level 10 before finishing floor 2-3.

Strategy:
1. Find some way to indirectly kill a person.
2. Aggro a non-property owner.
3. Get close to a dead body.
4. Have the hostile npc(non-property owner) hit the body once will cause them to have gain guilty status.
5. Lose the npc by running away or hit them enough for them to run away(don't kill them).
6. Without being spotted arrest the npc.
7. Congrats you have gained +100exp for a single npc.

Extra Notes:
If you want to optimize this strategy use a freeze ray gun it will omit the step of having them or you run away, you can arrest in them right after you freeze them. Also be sure to get nimble fingers if you want to rapidly arrest criminals.

Shapeshifter:

Strategy:
1. Possess the body of a thief.
2. Steal from everyone
3. Possess a doctor
4. Chloroform every property owner
5. Possess a police officer and aggro them to become criminals by letting them hit a dead body.
6. Arrest them
7. Congrats for all the floor exp bonuses of stealing, knocking out, and killing no one(the best class in the game)

Extra Notes:
Shapeshifter is easily the best class in the game and most dynamic. Be sure to get studious perk asap. To avoid cops just possess any slum dweller until you can find a thief or doctor.

Slum Dweller(all other classes minus doctor):

Strategy:
Same as above except you kill the npc instead of arresting them.
You will gain +75 exp for killing an npc that has attacked a dead body.

Extra Notes:
One of the weakest classes initially, however can become one of the most power by gaining levels. Every 2 character levels starting from character level 2 of the slum dweller will award 1 stat point, what this means is the slum dweller can maximize all of their stats to 4. The slum dweller can reach gorilla level stats while preserving the ability to use guns and speak with most npcs.

Doctor:

Strategy:
1. Chloroform
2. Profit
3. +20 exp knockout bonus, +200 floor knockout bonus(minimum 20 knockouts), +100 floor kill no one bonus.

Extra Notes:
As a doctor try your best to knock everyone out to gain the most exp, my personal best to floor
2-3 is lvl 9. Its one of the easiest class to level up. You can gain the kill profiter, healthalizer, and kill ammunizer bonus by smacking a chloroformed body.


I may one day clean up this guide and add screenshots but currently I'm too busy to do so.