I haven’t specifically searched for this, in fact I turned one down a few weeks ago because I was not sure I could find the leak. In theory you should be able to, but in practice I am not certain, given all of the different variables.
From use in lots of inspection in homes with slabs (95% of what I do), I find that I see the hot water lines sometimes when I run a fixture long enough. Not sure I can definatively say I have been able to see the cold water lines. I have also found that the hot lines tend to show up more in homes with a recirc pump.
I am interested in what others have done with this.