Is there anything stopping you from clicking on a link? Man you're just lazy.
Its listed under 47 USC 609, or the Telecommunications Act of 1934, or 47 USC 227. That act was amended with the Truth in Caller ID Act of 2009.
In legalese: Pub. L. 111-331, Dec. 22, 2010, 124 Stat.
I did. Did you actually read it?
Truth in Caller ID Act of 2009
The Truth in Caller ID Act of 2009, which was signed into law Dec. 22, 2010,
prohibits caller ID spoofing for the purposes of defrauding or otherwise causing harm. In June 2010, the Federal Communications Commission adopted rules implementing the Truth in Caller ID Act.
FCC Rules
Prohibit any person or entity from transmitting misleading or inaccurate caller ID information with the intent to defraud, cause harm, or wrongfully obtain anything of value.
Subject violators to a penalty of up to $10,000 for each violation of the rules.
Exempt authorized activities by law enforcement agencies and situations where courts have authorized caller ID manipulation to occur.
The FCCÂ’s Caller ID rules protect the privacy of the person calling by requiring telephone companies to make available free, simple and uniform per-line blocking and unblocking procedures. These rules give you the choice of delivering or blocking your telephone number for any interstate (between states) call you make.
(The FCC does not regulate blocking and unblocking of intrastate calls.)
Spoofing is not necessarily illegal. You should have read your link, smart ass.