Suspected Teenager in the house...

conclusive give away evidence...

Occasions -
On school nights

Locations -
On the floor somewhere in the area between the hallway, stairs,landing or study.

Times -
Inthe hours between Alex returning from school and his going to bed.

General arrangement -
This is quite a neat version - homework packed away , blazer the right way out and laid on top of the bag.
Other versions are more inside out, spilling out and either heaped up or strewn around.