  Supersymmetric spectra with a stop NLSP and a neutralino or gravitino LSP
present a special challenge for collider searches. For stop pairs directly
produced from QCD, the visible final-state particles are identical to those of
top quark pair production, giving very similar kinematics but often with much
smaller rates. The situation is exacerbated for compressed spectra with m(stop)
~ m(top) + m(LSP), as well as for lighter stops which can suffer from low
acceptance efficiencies. In this note, we explore the power of a direct stop
search using dileptonic mT2, similar to the one recently performed by ATLAS,
but more optimized to cover these difficult regions of the (m(stop),m(LSP))
plane. Our study accounts for the effects of stop chirality and LSP identity,
which can be significant. In particular, our estimates suggest that m(stop) ~
m(top) with a massless LSP is excludable for right-handed stops with bino-like
(gravitino) LSP with 2012 (2011) data, but remains largely unobservable in the
case of a higgsino-like singlino LSP. For each of these cases we map out the
regions of parameter space that can be excluded with 2012 data, as well as
currently allowed regions that would yield discovery-level significance. We
also comment on the prospects of a precision mT2 shape measurement, and
consider the potential of ATLAS's dileptonic stop -> b chi^+ searches when
re-interpreted for light stops decaying directly to the LSP.
