If you're going to follow them, get your timing right
Post-weekend is the prime tailing time. "If you want to tail somebody, because you suspect something’s going on, and you know what they do on the weekend -- like you’re home with the kids on the weekend -- that makes Monday more significant," McKeever says.
"Sometimes people say, ‘He used to come home at 6 on Wednesdays, now Wednesday and Thursday he comes home at 10:30/11 and he always has an excuse, but he used to not be that way.’ Well then, you focus on those days. But sometimes people say it’s completely random."
Those random cases are when it’s best to look at what they’re up to after the weekend. "Or when you come back from vacation, and you know that he’s been with you for 10 days, when you get back, that makes those few days more important."
"If you can pretend like you’re not suspicious and pay good attention, you’re better off than if you’re bugging somebody every day with things like, ‘How come you came home at 10:30? I thought you were gonna be home at 9,'" McKeever says.
If the person you’re trying to catch thinks you’re suspicious, they’re going to change up their routine and make it harder for you to tell that something’s up. "Be patient, and pretend like you’re too preoccupied with other things. Playing it cool is definitely better."
Just, please, don't Gone Girl anybody.
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Lucy Meilus is a staff writer for Thrillist and has absolutely no idea how to play it cool. Follow her on Twitter at @Lucymeilus.