You may have heard of TSA Pre-check, which gets you through the line faster and prevents you from getting groped by TSA. Last time I opted out of the millimeter wave scanner, I counted a total of 6 times where the guy rubbed his hands against my junk. Fortunately for him, I always opt out. There's also Global Entry, which not only includes TSA Pre Check, but also gets you into Immigration much faster at select US Airports. However, both of these services cost money, and even require personal interviews with unelected government bureaucrats. I was strongly considering purchasing Global Pass because of a recent return from abroad where we waited almost 2 hours in the immigration line. But during my last trip, I found a service you can get totally for free to speed you through immigration possibly as fast as Global Entry, and all you need is a smartphone!
Mobile Passport is an app I recently discovered on a trip home from Costa Rica. I was amazed when we landed in Miami to the most ridiculous line to immigration I'd ever seen, only to be told by workers there that I could skip all of it and go to a line where there was absolutely nobody to gain entry through immigration!
Mobile Passport a totally free app, and you simply download it to your phone, scan your US passport into it via your phone's camera, and then answer the same basic set of questions that are asked on the blue paper customs form you get each time you enter the USA. When you get back to USA, if you are arriving at one of the 25 airports that accept it, then you just click the 'submit' button in the app when you land, then you get to skip the big line and and go into a special line. Of course, as the secret gets out, this line might get longer, but you heard it first here! Do yourself a favor and get the free app to save yourself some time.
Bonus App: TSA also has an app called MyTSA, which is not nearly as useful as Mobile Passport, but it can tell you the amount of time you'll have to wait in a serpentine line before being groped, irradiated, and yelled at by felons on a power trip! It will also outline policies about how you cannot bring bottles of water onto a plane, but doesn't mention that agents fail 95% of tests where people bring in weapons and other dangerous things. As an added bonus it can even track your location!