I mean, we have seen and heard that they sweep the Bing, Vesuvio and i am assuming a number of other places. I am sure that they would sweep their cars. Remember in season five when tony tell Chris and Tony B they have to dig up bodies at his uncles far? Tony said be careful what you say, just had the car taken in or something along those lines. He is not a dumb guy and I am sure he sweeps for bugs in his cars, and so would chris.
Okay, the mafia has been around way longer than any other criminal organization and would have no trouble beating any of them in a war. They were, and still are ruthless and not to mention twice as smart as the beaners. Times have changed, and to stay out of the spotligh is a god thing and it helps avoid arrests and prosecutions. Black and Mexican gangs think theyre gangsters, running around with their "colors" but they look like theyre wearing halloween costumes. Leaving bodies everywhere = bad