The main premise of TT is that the practitioners can sense, with their hands, something they call the "human energy field" (HEF) and determine where it is deficient, uneven, etc. Without this ability, TT has no validity. A fourth grader's experiment found that TT practitioners can't reliably detect the HEF. And the TT practitioners haven't even bothered a replication of this study since then.
See "A Close Look at Therapeutic Touch," Emily Rosa, JAMA, 1 Apr 1998.