[Enlightened1]

Wrong....

“Whoever knowingly mutilates, defaces,
physically defiles, burns, maintains on the floor
or ground, or tramples upon any flag of the
United States shall be fined under this title or
imprisoned for not more than one year, or both.”

http://www.gpo.gov/fdsys/pkg/USCODE-2012-title18/pdf/USCODE-2012-title18-partI-chap33-sec700.pdf

[Ken H]

On 1990-06-11 the Supreme Court in the case of United States v. Eichman struck down the Flag Protection Act, ruling again that the government's interest in preserving the flag as a symbol does not outweigh the individual's First Amendment right to disparage that symbol through expressive conduct.

http://en.wikipedia.org/wiki/Flag_Protection_Act