No wonder the Patriots secondary was so often seen running several feet to several yards behind opposing receivers last season. If the Lincoln, Neb., police sergeant who arrested 23-year-old Alfonzo Dennard last Thursday for suspicion of drunk driving is to be believed, one of their starting cornerbacks has the lung capacity of someone who smokes four packs of Camels a day.

According to the arrest report, Dennard was pulled over for exhibiting the familiar sign of impaired drivers and impaired cornerbacks. He was weaving in and out of his lane. After stopping Dennard, they asked him to take a field sobriety test, results of which were not in the report. Twice, he allegedly blew too softly into a breathalyzer for it to register. Not surprisingly, someone representing Dennard breathlessly told a day later that Dennard was told he was “below the limit.”

If you know anything about cops, they don’t tell you that you are below the limit and then arrest you for DUI. I’m pretty sure they tell them in cop school that if you are going to charge someone with DUI, don’t start off by telling them their field sobriety test ‘‘did not indicate inebriation,’’ as Dennard’s mouthpiece whispered. I’m not sure of a lot of things in this case, but I’m sure of that.

I’m also sure that when someone tries to fool the breathalyzer, they are charged with refusing to submit to the test, as Dennard was sometime after 2 a.m. Which led me to wonder why these things seldom happen at noon after leaving a laundromat.

Allegedly, the sergeant twice asked Dennard to blow hard, and he did not. In many states this would all be on videotape, but this is Nebraska, where the same guy we’re talking about was convicted of assaulting a police officer and told he could do his 30 days in jail whenever he gets a free moment because the court wouldn’t want to interfere with the NFL’s needs. (But I digress.)

Google how to beat a breathalyzer. One of the first suggestions? DO NOT BLOW HARD.

According to a how-to written by a criminal defense attorney, there is more alcohol in the bottom of the lungs than at the top after drinking. The police want you to blow hard because it gets at that alcohol-rich air. However, “most breathalyzers require about seven seconds of uninterrupted breath but they do not require the person to blow hard. . . . The less time the air has spent in your lungs, the less alcohol will transfer.”

Not blowing hard is Dennard’s best defense. Sort of like going for it on fourth-and-2 at your own 28 against Peyton Manning. It’s a Hail Mary, but you argue “How diminished could I have been, your Honor? I knew enough to try to beat the breathalyzer.”