A complete listing of the Unauthorized and Restricted Activities can be found here.
The following activities have been declared unauthorized and restricted by the Boy Scouts of America:
All-terrain vehicles (ATVs) are banned from program use. ATVs are defined as motorized recreational cycles with three or four large, soft tires, designed for off-road use on a variety of terrains.
Boxing, karate, and related martial arts—except judo, aikido, and Tai Chi—are not authorized activities.
Chainsaws and mechanical log splitters may be authorized for use only by trained individuals over the age of 18, using proper protective gear in accordance with local laws.
Exploration of abandoned mines is an unauthorized activity.
Varsity football teams and interscholastic or club football competition and activities are unauthorized activities.
Fireworks secured, used, or displayed in conjunction with program and activities is unauthorized except where the fireworks display is conducted under the auspices of a certified or licensed fireworks control expert.
The selling of fireworks as a fund-raising or money-earning activity by any group acting for or on behalf of members, units, or districts may not be authorized by councils.
Flying in hang gliders, ultralights, experimental class aircraft, or hot-air balloons (whether or not they are tethered); parachuting; and flying in aircraft as part of a search and rescue mission are unauthorized activities.
Motorized go-carts and motorbike activities are unauthorized for Cub Scout and Boy Scout programs. All motorized speed events, including motorcycles, boats, drag racing, demolition derbies, and related events, are not authorized activities for any program level.
Participation in amateur or professional rodeo events and council or district sponsorship of rodeos are not authorized.
Hunting is not an authorized Cub Scout or Boy Scout activity, although hunting safety is part of the program curriculum.
(The purpose of this policy is to restrict chartered packs, troops, and teams from conducting hunting trips. However, this policy does not restrict Venturing crews from conducting hunting trips or special adult hunting expeditions provided that adequate safety procedures are followed and that all participants have obtained necessary permits and/or licenses from either state or federal agencies. While hunter safety education might not be required prior to obtaining a hunting license, successful completion of the respective state voluntary program is required before participating in the activity.)
Reference: Ranger Guidebook, No. 3128
Motorized personal watercraft, such as Jet-Skis(R), are not authorized for use in Scouting aquatics, and their use should not be permitted in or near BSA program areas.
Except for (1) law enforcement officers required to carry firearms within their jurisdiction, and (2) circumstances within the scope of the BSA hunting policy statement, firearms should not be in the possession of any person engaged in camping, hiking, backpacking, or any other Scouting activity other than those specifically planned for target shooting under the supervision of a certified firearms instructor. (Among the purposes of this policy is to prohibit adult leaders from bringing firearms on BSA camping and hiking activities or to unit meetings.)
Parasailing, or any activity in which a person is carried aloft by a parachute, parasail, kite, or other device towed by a motorboat, including a tube, or by any other means, is unauthorized.
All activities related to bungee cord jumping (sometimes called shock cord jumping) are unauthorized. Technical tree-climbing with ropes or harnesses is not authorized as a unit activity.
Water chugging and related activities are not authorized for any program level.
Pointing any type of firearm or simulated firearm at any individual is unauthorized. Scout units may plan or participate in paintball, laser tag or similar events where participants shoot at targets that are neither living nor human representations. Units with Council approval may participate in formally organized historical reenactment events, where firearms are used and intentionally aimed over the heads of the reenactment participants. The use of paintball guns, laser guns or similar devices may be utilized in target shooting events with Council approval and following the Sweet 16 of BSA safety. Council approval means the approval of the Scout Executive or his designee on a tour permit specifically outlining details of the event.
(However, law enforcement departments and agencies using firearms in standard officer/agent training may use their training agenda when accompanied with appropriate safety equipment in the Law Enforcement Exploring program.)
Carbon tetrachloride must never be used in any way in the Scouting program. Even in small quantities, this poison has proved to be so deadly that it must be ruled out as a cleaning fluid, a fire extinguisher, a poison for insect killing, and a watermark detector for stamp collecting.
Reference: Health and Safety Guide, No. 34415