Microscopic plastic chips called taggants could help investigators trace and identify explosives in cases like the Boston Marathon bombings. However, the technology isn't used because of pressure from the National Rifle Association and its industry allies, National Public Radio reports.

The NRA has argued the identifiers could dangerously destabilize gunpowder and be an early form of registration.

Microtrace is a Minneapolis company that makes taggants, according to NPR. "From our standpoint, you know, it's technology that we have and we make. And it has a function, and we know that it works in explosives," said William Kerns, president of Microtrace.

Click here, to learn more about Microtrace.