I read that David is left handed and yet as Justin in WOWP he uses his right hand a lot for instance he holds his wand in his right hand does any one know then if David is left or right handed and why he uses his right hand so much in WOWP

he's left handed. he writes with his left hand. I'm a lefty but do a lot of things with my right hand as well...it's mostly because it's really hard to be lefthanded only in this world of righthanded people :) I have learned to do a lot of things with my righ hand out of necessity (like cutting with escissors) because a lot of times our world is set up for righthanded ppl