What is Cruz Demarco's alibi when the police question him in regard to Jenny's rape in the novel, All Is Not Forgotten?

Cruz Demarco is the driver of a blue Honda Civic that is sighted at the party the night of Jenny's rape. He is arrested for making a drug sale as officers watch, but later has an alibi for the time frame in which Jenny is attacked. He has a debit card receipt from a store that confirms his whereabouts.