Citation needed. There are 700,000 cops in the US, some conducting 20+ traffic stops a day. How many people are being arrested because they asserted their rights? Especially in the age of smart phones and body cameras, it's pretty small. Of course it happens, no system is perfect, though we should strive to be, your rights aren't a formality. Don't flex them, exercise them. They're like muscles. Flexing is just showing off for no real purpose. Exercising them makes them stronger. Not exercising them makes them atrophy.