What Items are Considered Illegal?

[TheExtremeBurger]

So on DF, using certain items can result in a ban if you use them in plots.

But what items are considered illegal?
Or more specifically, what certain NBT data does an item need to have to be considered Illegal?

 

[DogWithHats]

To my knowledge:
>Creative Kill Pots
>HD Heads
>Lag Items/Fireworks