Reply #46: Actually it is a matter of criminal law

[MadHound]

"8 U.S.C. § 1325 : US Code - Section 1325: Improper entry by alien
Search 8 U.S.C. § 1325 : US Code - Section 1325: Improper entry by alien

(a) Improper time or place; avoidance of examination or inspection;
misrepresentation and concealment of facts
Any alien who (1) enters or attempts to enter the United States
at any time or place other than as designated by immigration
officers, or (2) eludes examination or inspection by immigration
officers, or (3) attempts to enter or obtains entry to the United
States by a willfully false or misleading representation or the
willful concealment of a material fact, shall, for the first
commission of any such offense, be fined under title 18 or
imprisoned not more than 6 months, or both, and, for a subsequent
commission of any such offense, be fined under title 18, or
imprisoned not more than 2 years, or both.

<http://codes.lp.findlaw.com/uscode/8/12/II/VIII/1325>

When you can be imprisoned, it is entering the realm of criminal law:shrug: