We present a general derivation of the Duffin-Kemmer-Petiau (D.K.P) equatio
n on the relativistic phase space proposed by Bohm and Hiley. We consider g
eometric algebras and the idea of algebraic spinors due to Riesz and Cartan
. The generators beta(mu)((p)) of the D.K.P algebras are constructed in the
standard fashion used to construct Clifford algebras out of bilinear forms
. Free D.K.P particles and D.K.P particles in a prescribed external electro
magnetic field are analized and general Liouville type equations for these
cases are obtained. Choosing particular values for the label p we classify
the different types of the D.K.P Liouville operators.