Assuming this acts only as a glorified replacement for a memorized license number, it seems like a nice convenience. But the nice thing (from a law-enforcement

Assuming this acts only as a glorified replacement for a memorized license number, it seems like a nice convenience. But the nice thing (from a law-enforcement perspective) about plastic IDs is that they can be made expensive to forge/alter, and (forgeries aside) it's fairly easy to restrict the number of copies.