  We consider three states which are likely to be realized in bi-layer quantum
Hall systems at total Landau level filling fraction ${\nu_T}=1$. Two of these
states may be understood as paired states. One can occur as an instability of a
compressible state in the large $d/l_B$ limit, where $d$ and $l_B$ are the
interlayer distance and magnetic length. The other is the $(1,1,1)$ state,
which is expected in the small $d/l_B$ limit. We propose that the longitudinal
and Hall drag resistivities can be used to distinguish these different quantum
Hall states. The drag resistivities may be computed in a straightforward manner
using the paired state formulation.
