It is the FDA. Technically, it is a portion of the FDA called teh Center for Devices and Radiological Health (CDRH.)

Continue.

http://www.fda.gov/cdrh/

Importing Lasers http://www.fda.gov/cdrh/devadvice/39i.html

All Laser Regulations http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfTopic/topicindex/topindx.cfm?alpha=l