  Recent analyses of the statistical distribution of the temperature
anisotropies in the CMB do not rule out the possibility that there is a large
non-gaussian contribution to the primordial power spectrum. This fact motivates
the re-analysis of the curvaton scenario, paying special attention to the
compatibility of large non-gaussianity of the local type with the current
detection limits on the isocurvature amplitude in the CMB. We find that if the
curvaton mechanism generates a primordial power spectrum with an important
non-gaussian component, any residual isocurvature imprint originated by the
curvaton, would have an amplitude too big to be compatible with the current
bounds. This implies that the isocurvature mode should be equal to zero in this
scenario and we explore the consequences of this inference. In order to prevent
the generation of a such a signal, the CDM must be created at a late stage,
after the curvaton decays completely. This requirement is used to constrain the
nature of the CDM in this scenario, arriving at a general relation between the
temperature of the universe at CDM creation and the scale of inflation.
