Is there a law forbidden us to lie?

Kinda, It depends where you are. I hope you are not in court lol

Explanation: Although the Supreme Court declared almost forty years ago that “there is no constitutional value in false statements of fact,” the Court in United States v Alvarez ruled that the First Amendment protects at least some -- and perhaps many -- intentional lies from government prohibition.

this can !    

- jack watson

answer; the edward snowden leaks of nsa classified material;