Introduced by Senator Kay Williams (R-NY) on June 25, 2006, X-ID is an act which states that the federal government will only accept IDs (such as drivers licenses and passports) which fit certain guidelines. States do not have to conform to these guidelines, but if they do not, their IDs will not be nationally valid. The guideline X-ID puts into place is that every person who applies for a new or renewed ID must be tested for the X-factor. If they are a mutant, that will be marked on their ID with an 'X', and in some cases (as determined by the state) further information, such as a danger level or category of mutation, may be included. IDs without X-identification will no longer be accepted after a period of eight years.

The government has technology which allows X-ID testing to be possible. It requires a blood sample and takes about 6 to 8 hours to return a result. It runs 96 tests at a time, and each person will have two samples tested. It's not a point-and-scan, but it is cheap, fast, and easy to produce in bulk, making it possible for there to be thousands of testing centers around the US in minimum time.

X-ID was declared unconstitutional by the Supreme Court and overturned on March 2, 2007.

The Simmons Amendment requires that all mutants register in the Mutant Registration Database within thirty days from the date X-ID was signed into law. X-ID became law on July 17, 2006, and all mutants are legally required to be registered by August 16, 2006. The penalty for not registering is determined by individual states. In New York, it is a class B misdemeanor, which can be cause for up to three months of jail time, 1 year of probation, and a fine not to exceed $500.

Thanks to the influence of the Hellfire Club, New York has chosen to make the penalty for not registering quite minimal. If caught, a non-registered mutant is fined $10-$20 and the misdemeanor will be added to their criminal record.

Registering involves adding all personal information - name, birthdate, address, phone number, social security number, employment information, etc - as well as the extent and type of the mutation. If it is determined that a person is being uncooperative or may be lying, further testing to determine the specifics of a mutation can be ordered - however, given the cost and time this involves, it's likely that if this sort of testing becomes required, there will quickly be a backlog of DNA tests.

The Simmons Amendment, commonly known as Mandatory Registration, was declared unconstitutional by the Supreme Court and overturned on March 2, 2007.