  The Muon Ionization Cooling Experiment (MICE) will perform a detailed study
of ionization cooling to evaluate the feasibility of the technique. To carry
out this program, MICE requires an efficient particle-identification (PID)
system to identify muons. The Electron-Muon Ranger (EMR) is a fully-active
tracking-calorimeter that forms part of the PID system and tags muons that
traverse the cooling channel without decaying. The detector is capable of
identifying electrons with an efficiency of 98.6%, providing a purity for the
MICE beam that exceeds 99.8%. The EMR also proved to be a powerful tool for the
reconstruction of muon momenta in the range 100-280 MeV/$c$.
