  Lorentz- and CPT-violating effects initiating two-body electromagnetic
flavor-changing decays of charged leptons are studied in the framework of
Lorentz-violating effective field theory. An analysis of data from experiments
at the Paul Scherrer Institute and at the Stanford Linear Accelerator measuring
the branching ratios of these decays provides 576 constraints on independent
flavor-changing effects in the charged-lepton sector, consistent with no
Lorentz and CPT violation at the level of parts in $10^{-13}$ GeV$^{-1}$ to
$10^{-9}$ GeV$^{-1}$.
