Apparently you have to notify Homeland security before you mark a running/cycling course with flour (=green) now…
Happened to the hash house harriers http://www.gthhh.com/ in Conneticut http://www.courant.com/news/local/hc-ctapikeapowder0825.artaug25,0,7074752.story?track=rss
Sad state of paranoia…