[dirtboy]

And the provision in the Constitution authorizing the Congress to make such an edict?

I would tie this to reciprocity. If one state issues a driver's license, it is honored as ID in all states under federal law. So if a few states have lax guidelines, it undermines the integrity of those states who have sound guidelines.

[greydog]

I thought the DL original purpose was to verify that the State which issued it confirmed that the individual to whom it was issued to proved to the same that he/she had the necessary skills to safely operate a motor-driven vehicle.

[eyedigress]

You are correct. Some forget that security is the downfall of freedom.

[weaponeer]

I would tie this to reciprocity. If one state issues a driver's license, it is honored as ID in all states under federal law. So if a few states have lax guidelines, it undermines the integrity of those states who have sound guidelines.

There is no such thing as reciprocity anymore. It's gone with other parts of the Constitution. My Texas Concealed Handgun License is not honored by all other states. And the CHL is a "public act" just the same as the issuance of a driver's license or a marriage license. (States are also ignoring marriage licenses they don't like.)