  We demonstrate the utility of leptons which fail standard isolation criteria
in searches for new physics at the LHC. Such leptons can arise in any event
containing a highly boosted particle which decays to both leptons and quarks.
We begin by considering multiple extensions to the Standard Model which
primarily lead to events with non-isolated leptons and are therefore missed by
current search strategies. We emphasize the failure of standard isolation
variables to adequately discriminate between signal and SM background for any
value of the isolation cuts. We then introduce a new approach which makes use
of jet substructure techniques to distinguish a broad range of signals from QCD
events. We proceed with a simulated, proof-of-principle search for R-parity
violating supersymmetry to demonstrate both the experimental reach possible
with the use of non-isolated leptons and the utility of new substructure
variables over existing techniques
