For the past number of years both countries have legally exchanged information on criminal activity. As of June this year at Homeland Security's insistence it has been expanded to require full disclosure. So, border guards now can tell to the day, the number of days in each other's countries, how many times we crossed, any offences including problems at the border, etc. In other words, you cannot hide anything.
Two years ago an acquaintance, who drives a Class B, but spends a lot of time in a park model in the RV park we used to stay in St Pete's got turned around at the border in Detroit. The reason was that he had been turned away at the Manitoba/ North Dakota border about 20 years previous and the US border guard wanted an explanation. John couldn't remember the incident, so he was not allowed to cross. After he got home, his mother reminded him that he and several friends had gone to a wedding, after the bachelor's party, being fairly well inebriated the decided to cross into the states. Since the guard felt that they were not in a state to legally drive they were not allowed in. So, 20 years later, no charges, no conviction, other than the guards feeling (likely correct) that they were drunk, gave the US guard the ability to refuse entry. In other words, please don't knock our border services for disallowing entry for a DUI.
Ed