  Using stellar dynamics and strong gravitational lensing as complementary
probes, Sand et al. (2002, 2003) have recently claimed strong evidence for
shallow dark matter density profiles in several lensing clusters, which may
conflict with predictions of the Cold Dark Matter paradigm. However, systematic
uncertainties in the analysis weaken the constraints. By re-analyzing their
data, we argue that the tight constraints claimed by Sand et al., were driven
by prior assumptions. Relaxing the assumptions, we find that no strong
constraints may be derived on the dark matter inner profile from the Sand et
al. data; we find satisfactory fits (with reasonable parameters) for a wide
range of inner slopes 0 < beta < 1.4. Useful constraints on the mass
distributions of lensing clusters can still be obtained, but they require
moving beyond mere measurements of lensing critical radii into the realm of
detailed lens modeling.
