Amy Larson readily admits writing “9/11 Truth” and “9/11 Truth Now” in chalk on the First Street sidewalk over Napa Creek.“I just want people to think for themselves,” said Larson, 29. “I believe we’ve lost a lot of civil liberties since the 9/11 attacks. I’m really concerned about that. “This is political free speech,” added Larson, who says the investigation into the terrorist attacks in New York City and Washington, D.C. should be reopened. Her chalk writing — which occurred Sept. 11, the 11th anniversary of the terrorist attacks — got Larson arrested on suspicion of vandalism.