  Non-Abelian phases are among the most highly-prized but elusive states of
matter. We show that upstream noise measurements can identify the putative
non-Abelian fractional quantum Hall plateaus at filling factors
$\nu=\frac{12}{5}$ or in any half-filled Landau level. Interfacing these states
with any readily-available Abelian state yields a binary outcome of upstream
noise or no noise. Judicious choices of the Abelian states can produce a
sequence of yes--no outcomes that fingerprint the possible non-Abelian phase by
ruling out its competitors.

Strongly Correlated Electrons