It’d be very useful. Imagine having a weapon capable of killing someone off covertly. You could keep the capsule in a lead box, and whenever you want to get rid

It’d be very useful. Imagine having a weapon capable of killing someone off covertly. You could keep the capsule in a lead box, and whenever you want to get rid of an enemy, put the capsule somewhere close to where they sleep, and leave it there long enough to induce radiation sickness or cancer in the target. Then you could retrieve the capsule and continue this process with another enemy.