Lord Baden-Powell, the founder of Cubbing and Scouting, once met an African chief who greeted him by shaking hands with the left hand. The chief explained that the left handshake was a sign of trust.
Today, in cultures where it is acceptable, Cubs and Scouts shake hands with the left hand. It is a sign that they are all members of the Worldwide Scouting family.
(Extract from "Cub Book" - page 31 - By Scouts Canada)