I had the opposite reaction from my players regarding a nuclear demolition charge which they had managed to acquire *legally* . . . since I let it be known that the Empire made extra-special certain to keep a record of the isotope signatures of all weapon's grade nuclear materials produced in or imported into the Imperium, as well as the full chain of legal purchasers.

There were several times the players *wanted* to deploy it. But each time they decided that the situation just wasn't quite dire enough to court official Imperial disfavor . . .

[I got the idea from the movie "Sum Of All Fears," in which isotope analysis revealed the production facility/batch for the nuclear material in question.]