There was a serial killer who kidnap people at night

Answer At The Last Slide

He played a clever game of death with people.

He would give the victim 2 pills.

One pill is red and one is blue.

He said one of them is poisoned and the other one is not.

The victim had to choose one pill and the killer takes the other one.

Still, every time, the victim died and the killer survived.

How did he manage to do that with the people ?

   ANSWER The poison was actually in the water that victim always drinks to gulp down the pill.