They say an ounce of prevention is worth a pound of cure. Whether you measure you favorite chemical indulgences in grams or ounces you need to take some basic cell phone safety precautions. First, a disclaimer, a warrant and a dedicated forensic technologist can find pretty much anything on your IOS or Android device (Blackberries are the most secure phones available, but who wants to use a grandpa phone with real buttons?). But, with the right settings/apps/common sense you may be able to get through most traffic stops and common police encounters without getting yourself or your friends in more trouble than the initial detention.
How does a law enforcement officer (let’s call him LEO) use cell phone data? The most common way is when you are arrested and the officer just picks the phone up and starts reading your texts to see who your dealer/connect/reup is. The officer may also answer your phone or send texts to try and generate some more offenses/arrests. Now the Supreme Court has held that cell phone data is protected and the police must have a warrant to search your phone, but Constitutional protections tend to find exceptions (we have a drug war to fight, and most judges are on the side of the Government), also most snitch deals are never seen in court and LEO may look at your phone anyway just to see who is in your network of friends without intending to use the evidence in court. On to the tips.
On to the rules-