On the Person Constraint on Romanian se-passives

It has long been recognized that sentences with passive se obey a Person constraint:
the subject cannot be 1st or 2nd person. I discuss a further constraint on the subject,
manifest in Romanian: not only 1st or 2nd person pronouns, but all those DPs that
must be marked by the prepositional object marker accompanied by clitic-doubling
when functioning as direct objects are excluded from being subjects of se-passives.
Following Richards (2008), I propose that these DPs, which are high on the Person/
Animacy scale, have a Person feature (manifested by clitic-doubling when they are
case-licensed by v*), whereas those that can occur as subjects of se-passives lack the
Person feature completely. The ban on +Person internal arguments in se-passives is
due to the intervention of the Person feature associated with the external argument.
I argue that the element saturating the external argument is differently projected
in se-passives vs. participial passives, which explains the lack of an intervention
effect in the latter case.