yes that is right. Andrewtb, congratulations for getting the first riddle. New riddle will come later tonight.
Riddle Response

I think the answer to the second riddle is that the drugs the man was taking altered his DNA and fingerprints.

YFIOTR there are 3 answers to this riddle:
1.) (Mentioned by allthepeace)
The drugs altered the guy's DNA.
2.) (MY IDEA)
The police DECIDED to kill him. That doesn't mean they did.
3.) In the future, it may be possible to clone people. 10 years right? Who knows. In 10 years we may be able to clone.

I have solved this riddle! The man didn't have any siblings, how is this possible? Well, his parents, seeing what a terror he was in childhood, decided not to have another child!

Yeah really. Our answers make perfect sense YFIOTR. There might be more than one answer to your riddle.

I will tell you that it is a pretty simple answer. Please don't criticize. It has nothing to do with technology. Think of this: three frogs on a log. two decide to jump off. How many are left? (not a riddle for a trophy but a clue)
After you consider that, then answer the question.
This is the forum for riddle responses. The first one with the right answer gets a trophy.