  We first describe a Rieffel induction system for groupoid crossed products.
We then use this induction system to show that, given a regular groupoid $G$
and a dynamical system $(A,G,\alpha)$, every irreducible representation of
$A\rtimes G$ is induced from a representation of the group crossed product
$A(u)\rtimes S_u$ where $u\in G\unit$, $A(u)$ is a fibre of $A$, and $S_u$ is a
stabilizer subgroup of $G$.
