A former US marine who was taken from his home and involuntarily detained for psychiatric evaluation for posting controversial song lyrics and conspiracy theories on Facebook is to file a civil lawsuit against the FBI and police. Speaking for the first time since his release, after a judge ruled there was insufficient evidence to detain him, Brandon Raub said his experience was frightening and that it sent a extremely alarming" message to Americans. Raub, 26, a former combat engineer who has served in Iraq and Afghanistan, was taken forcibly from his home in Chesterfield County, Virginia, by two FBI agents and police on 16 August. He was not charged with any crime. He was handcuffed and detained in a psychiatric hospital for seven days before a judge ruled on 23 August that there was not sufficient evidence to keep him there. In an interview ... Raub said: "It made me scared for my country. The idea that a man can be snatched off his property without being read his rights I think should be extremely alarming to all Americans." He said that Americans needed to educate themselves about government intrusions into the lives of citizens, and he urged people to do so. Raub's mother, Cathleen Thomas, told reporters that her son ... is "concerned about all the wars we've experienced" and believes the US government was complicit in the September 11 terrorist attacks. One of his Facebook posts, she said, pictured the gaping hole in the Pentagon and asked "where's the plane?