Polygraphs are voodoo science anyway, and are about as reliable as a 1970 AMC Gremlin with a load of sand in the carburetor and half the spark-plug wires missing.
But this is absolutely unconscionable. We DO have a right to free speech, and to attempt to prosecute somebody simply teaching skills, shows that our government no longer has any credibility - it has connection to the government we intended to found, and no validity. Our government is the enemy now. So if the NSA, FBI, CIA, ATF, DOJ and friends want to treat us like the enemy, then fine... we'll be the enemy.