Murder or Suicide? - What Do You Think?

A dead body lies at the bottom of a multistory building. It looks as though he committed suicide by jumping from one of the floors.

When the detective arrives, he goes to the first floor of the building, opens the closed window, and flips a coin towards the floor. He goes to the second floor and does the exact same thing. He continues to do this until he gets to the top floor of the building.

When he comes back down, he states that it was a murder and not a suicide. How does he know that?

(Entry to the terrace was banned due to some ongoing work).

Read the detective's logic in the case!

Detective's Logic in Murder Mystery

What is the case?

Obviously, the person can't jump with window closed or come outside of the window & close that window from inside.

The detective checks if windows is closed from inside by opening window & flipping the coin toward the floor. He flips the coin to mark the count of that particular floor where window was closed from inside & he has to open it to flip the coin.

At the end, he collects as many coin as floors of that building. So he concludes that no floor had open window from where the person might have jumped.

 
So, he concludes that it was the murder and not the suicide.

Poisonous Drink

Marissa and Juliana went out for drinks together. They ordered the same drink. Juliana was really thirsty and finished five in the time it took Marissa to finish one. The drinks were poisoned, but only Marissa died. How?

TIP : Poison wasn't in Marrisa's glass neither added externally by any one.

This is how Juliana survived! 

Harmless Poisonous Drink

What was the incident?

That's because the poison was in the ice. Since Marissa took time to drink her first, the ice melted & poison got mixed up in the drink very well. Whereas, Juliana was thirsty & finished drinks in hurry; it didn't get enough time to melt the ice & hence poison didn't get mixed up with the drink. That's how Juliana survived!