So... Canonizations... Infallible or not?

Bishop Giuseppe Sciacca, a remarkable prelate and Canon Lawyer and current Adjunct Secretary of the Supreme Tribunal of the Apostolic Signatura, granted days ago the following interview to La Stampa (posted here for the record of current events):

Bp. Sciacca and Pope Benedict XVI

Is the Pope infallible when he proclaims a new saint?

“According to the prevailing doctrine of the Church,