The United States has a unique situation for its "drone" regulations, relative to other countries.
The Federal Aviation Administration, the federal body responsible for regulating the nation's airspace, has not yet established regulations for integrating unmanned aircraft systems (UAS) into the national airspace system (NAS). As part of the FAA's re-authorization in 2012, Congress has legislated that the administration must establish those rules by 2015.
In the meantime, commercial unmanned aviation is at a standstill in the United States. While the FAA will allow the use of UAS on a case-by-case basis from government entities in a process known as a Certificate of Authorization (COA), that option is not available to the general public. The FAA also allows hobbyists to operate robotic model aircraft under Advisory Circular 91-57, which specifies those aircraft must never fly above 400 feet or within 2 miles of an airport, but the use of UAS for commercial media qualifies as commercial use.
More details on the regulation of UAS in the United States is available on the FAA's website.
States have taken it upon themselves to begin regulating UAS with "drone" legislation. As of March 2013, no state has passed any such laws. But so far, 29 states have begun the process of establishing regulations.
The majority of these laws restrict law enforcement from using unmanned systems without a search warrant. However, several states are in the process of banning the photography of private properties, or outlawing "drone" technology outright. New Hampshire, in particular, bans all aerial photography of private property of persons, including photos obtained via satellite.
Below is a Google Map identifying those states who have sought to limit use of UAS. Darker colors indicate more stringent laws with harsh penalties. Clicking on a colored state will reveal the specific regulations being proposed, the authors of the bill, and a link to follow the progress of the legislation.
Should any of these laws pass, it is not entirely clear that they will carry any weight at the federal level, given that the Supreme Court recognizes the FAA's regulatory authority over the NAS.