Cincinnati protestor charged with disorderly conduct after taking pictures of a covert police vehicle.

When did it become illegal to take pictures of police vehicles?

One individual, 36-year-old Lloyd Jordan, of Clifton, was charged with disorderly conduct while intoxicated and obstructing official business after police officers said he took photographs of a covert police vehicle, including the license plate. His arrest sheet does not address why officers believed Jordan to be intoxicated.
http://communitypress.cincinnati.com/article/AB/20111116/NEWS010701/311160147/16-Occupy-Cincinnati-protesters-arrested?odyssey=nav|head