So the jury-rigged emp pack (the one you can find in safes and that only have one use), do not delete themselves when use and infact can be used forever.

The following error occurs when you use the emp pack in a level:

Sim returned:
workshop-580661011/strict.lua:17: variable 'trashItem' is not declared
stack traceback:
workshop-580661011/strict.lua:17: in function <workshop-580661011/strict.lua:15>
workshop-1745350836/inventory.lua:69: in function 'useItem'
workshop-2151835746/abilities/prime_emp.lua:42: in function 'executeAbility'
game/sim/simactions.lua:79: in function '?'
game/sim/engine.lua:2100: in function 'applyAction'
game/client/states/state-game.lua:362: in function <game/client/states/state-game.lua:359>

stack traceback:
[C] in function 'assert'
workshop-580661011/strict.lua:17 in function <workshop-580661011/strict.lua:15>
workshop-1745350836/inventory.lua:69 in function 'useItem'
workshop-2151835746/abilities/prime_emp.lua:42 in function 'executeAbility'
game/sim/simactions.lua:79 in function '?'
game/sim/engine.lua:2100 in function 'applyAction'
game/client/states/state-game.lua:362 in function <game/client/states/state-game.lua:359>