  Searches for supersymmetry at the Large Hadron Collider (LHC) have
significantly constrained the parameter space associated with colored
superpartners, whereas the constraints on color-singlet superpartners are
considerably less severe. In this study, we investigate the dependence of
slepton decay branching fractions on the nature of the lightest supersymmetric
particle (LSP). In particular, in the Higgsino-like LSP scenarios, both decay
branching fractions of $\tilde\ell_L$ and $\tilde\nu_\ell$ depend strongly on
the sign and value of $M_1/M_2$, which has strong implications for the reach of
dilepton plus MET searches for slepton pair production. We extend the
experimental results for same flavor, opposite sign dilepton plus MET searches
at the 8 TeV LHC to various LSP scenarios. We find that the LHC bounds on
sleptons are strongly enhanced for a non-Bino-like LSP: the 95% C.L. limit for
$m_{\tilde\ell_L}$ extends from 300 GeV for a Bino-like LSP to about 370 GeV
for a Wino-like LSP. The bound for $\tilde\ell_L$ with a Higgsino-like LSP is
the strongest (~ 490 GeV) for $M_1/M_2$ ~ $-\tan^2\theta_W$ and is the weakest
(~ 220 GeV) for $M_1/M_2$ ~ $\tan^2\theta_W$. We also calculate prospective
slepton search reaches at the 14 TeV LHC. With 100 fb$^{-1}$ integrated
luminosity, the projected 95% C.L. mass reach for the left-handed slepton
varies from 550 (670) GeV for a Bino-like (Wino-like) LSP to 900 (390) GeV for
a Higgsino-like LSP under the most optimistic (pessimistic) scenario. The reach
for the right-handed slepton is about 440 GeV. The corresponding 5$\sigma$
discovery sensitivity is about 100 GeV smaller. For 300 fb$^{-1}$ integrated
luminosity, the reach is about 50 - 100 GeV higher.
