  We show how spectroscopic experiments on a small Laughlin droplet of rotating
bosons can directly demonstrate Haldane fractional exclusion statistics of
quasihole excitations. The characteristic signatures appear in the
single-particle excitation spectrum. We show that the transitions are governed
by a "many-body selection rule" which allows one to relate the number of
allowed transitions to the number of quasihole states on a finite geometry. We
illustrate the theory with numerically exact simulations of small numbers of
particles.
