Well, it's not the first time he's lied (or "forgotten") when asked directly about a crime/arrest:
http://www.cbc.ca/news/canada/toront...charge489.html
When the Sun first asked him about the incident, he denied ever being charged. But he later backtracked after being provided with Florida state records of his arrest, saying he "completely forgot" about the episode.
"When somebody discusses [the marijuana charge] with me, the first thing that pops into my head was failing to provide a breath sample," Ford said Thursday.