hate to say it.. especially since i'm not in the PI business.. but that sounds logical. who would hire someone to watch you. Unless you're being staked for some reason. I would just think that a stakeout would just be more like sitting in a car or van on the street. BTW, check your phones (not to be paranoid or nothin, but hell why not) to see if they are bugged in some way. On cordless' open the batter pack, if the face comes off, look for something that doesn't seem right. Look for something in/near the wall or jack.
Only thing is, with telecommunications technology now, if they have a warrant to tap your phone.. all they have to do is push a button on a terminal at the phone company (i think.. not sure).. you'd think it'd be that easy. (reason you can do *69, *67, caller ID etc).. is b/c it's all computer driven now.
i dunno .. just a paranoid thought. If anyone knows any other techniques used to tap phones etc.. it'd be cool/nice to know about them.