Playing KJo Preflop

[SnglMaltScotch]

Ok, Ok, God, I admit it. I don't know how to play KJo preflop. I am telling God because he gave it to me no less than 10 times in 300 hands last night.

I don't have the actual hand histories but here are the villians.

The table was pretty typical except for one retard that was 2 to my left (thus making button raising very difficult). He was 70/3/0.2 and called EVERY raise in his BB. Pretty much everyone else was 30-40/10-15/2. We were all working off retarts money and enjoying the benefits.

I would like opinion on 4 scenarios all of with I got last night.

KJo under the gun.
KJo on the button behind 1 limper. Remember BB is guarenteed to call if raised.
KJo in sb with retard and one other limper
KJo in BB with retard and sb completed.

Are they all raises. Some... None??