Kerala police is interested in only two works
1. Immoral traffic cases
2. Vehicle checking
Other cases they are not serious whether they are murder cases or cases against national security.
Eg:
1) Cases against Madani,
2) Explosive recovered from train etc
IF you are going to kerala and you are married, you need to take marriage certificate while travelling in kerala .Otherwise police will charge you against immoral traffic.
Once I was going to Munnar with my wife and parents .Kerala police came for vehicle checking .I had shown all the valid papers to the inspector, even after that the inspector asked me who is the lady sitting inside the car. I answered that those are my parents and my wife. They were doubtful about that asked me to stand there .I understood their point of view and showed my marriage certificate with photos. The inspector asked the constable to compare the photos in marriage certificate .After the verification they allowed me to travel.
While traveling if anyone asks for any help from Kerala Police, they will roar against you. If you are asking any assistance to Karnataka police or Tamil Nadu police they will guide you in correct way.