  Determining the spin of new particles is an important tool for discriminating
models beyond the Standard Model. We show that in case of cascades of
subsequent two body decays the existing strategy to extract the spin from
lepton and quark spectra can be used without changes even if one allows for
dim-5 and dim-6 operators which might be induced by physics just beyond the
reach of LHC. We show analytically that these operators do not change the
overall structure of these spectra.
