  I review a recently proposed scaling analysis of hadron suppression in Deeply
Inelastic Scattering on nuclear targets measured at the HERMES experiment. The
analysis can distinguish 2 competing explanations for the observed suppression,
namely, quark radiative energy loss with long hadron formation times, and
prehadron nuclear absorption with hadronization starting inside the nucleus.
Experimental data are shown to favor short formation times and prehadron
absorption.
