Poltergeist

Poltergeist are very noisy,it is easier to identify by actions.

Danger Level
Normal Ghost (+1)

Noisy (-1/2)

A Poltergeist is a danger level of 1/2.

Freezing Temperature
This can be found 2 ways.

One way it can be found is by breath,

the other way can be found by the Thermometer,if it is below 0 then Freezing Temperatures is evidence.

Spirit Box
This can be used with audio.If a voice is heard after asking a question,it is evidence.

Ghost Orb
Ghost Orb can be found with a NV Camera.

It also might be good to ask the ghost a question in the room with the orb,or looking for freezing temp.

Behavior
Poltergeists are very noisy ghosts.Objects can be thrown and noises can be heard everywhere.The noises can be counted itself.