  We present a feasibility study, to search for dark matter at the LHC, in
events with one soft hadronically decaying tau lepton and missing transverse
energy recoiling against a hard $p_{T}$ jet from initial state radiation. This
methodology allows the search for Supersymmetry in compressed mass spectra
regions, where the mass difference between the lightest neutralino,
$\tilde\chi_1^0$, and the stau (the tau superpartner), $\tilde{\tau}$, is
small. Several theoretical models predict a direct connection between thermal
Bino dark matter and staus within this scenario. We show that compressed
regions, not excluded by ATLAS nor CMS experiments, are opened up with the
increase in experimental sensitivity reached with the proposed methodology. The
requirement of a hard jet from initial state radiation combined with a soft tau
lepton is effective in reducing Standard Model backgrounds, providing expected
significances greater than 3$\sigma$ for $\tilde{\chi}_{1}^{\pm}$ masses up to
300 GeV and $\tilde{\tau}$-$\tilde{\chi}_{1}^{0}$ mass gaps below 25 GeV with
only 30 fb$^{-1}$ of 13 TeV data from the LHC.
