[henderson field]

However, anything can be forged and the printing presses will be working overtime in old Mexicali.

[squirt-gun]

However, anything can be forged and the printing presses will be working overtime in old Mexicali

Absolutely not true.

An eye scan is 100% perfect for personal identity and can't be forged..

[Moral Hazard]

"However, anything can be forged and the printing presses will be working overtime in old Mexicali."

Even if this were the case, the question of effectiveness is different from the question of Constitutionality.