  Denis associated to each Drinfeld module M over a global function function
field L a canonical height function, which plays a role analogous to that of
the Neron-Tate height in the context of elliptic curves. We prove that there
exist constants \epsilon>0 and C, depending only on the number of places at
which M has bad reduction, such that either x in M is a torsion point of
bounded order, or else the canonical height of x is bound below by \epsilon
max{h(j_M), deg(D_M)}, where j_M is a certain invariant of the isomorphism
class of M, and D_M is the minimal discriminant of M. As an application, we
make some observations about specializations of one-parameter families of
Drinfeld modules.
