(Sorry, bit yucky/grim).
... drops of blood in the communal stairwell?
It's a regular occurrence. We live in a side bit of a council block, with a set of stairs that just lead up to our flat but are connected to a main stairwell. In recent weeks, I've often opened the door to find a homeless person (rarely ever the same person) sleeping on the landing just below.
There are also often these inexplicable drops of blood on the communal stairs and the walls, just like 2 or 3 drops.
Is this a sign that somebody is shooting up there?
I'm probably a bit naive but this was the only explanation I could think of, and it makes me feel really funny and unsafe about the people sleeping on my stairs.
(Also... what do I do about it? It's a closed building that you should only be able to get into with a key fob or by being buzzed in, but it's obviously pretty easy for anyone to slip in after a resident).