But it is very important when you can prove premeditation, from something out of the suspects own testimony. Think of it this way-- The defense is going to say that the gun is open to reasonable doubt, maybe it was Travis's, as there is no solid evidence. Same with the gas cans, as some women have said, they too put extra gas in their trunks if alone on a road trip, as a precaution. So on and on, the DT will try and eliminate these factors, as unreliable.
So if you can get some of the premeditation factors, coming out of the suspects own testimony, BINGO. What can the DT say? Our client was lying, don't listen to her...