In the modern age,counter surveillance is non-existent. Given the incredible technological advances that Law enforcement has at their fingertips,the best advice is to assume that every phone you use is tapped,every meeting you attend is observed and/or monitored,and every time you go anywhere,someone is watching. So don't use names,don't discuss any specific details, and limit your exposure to any incriminating info. Then,after you've done all this,pray that some rat won't throw all your effort out the window.