Paraffin tests don't prove squat. They are about as useful if not less than a lie detector test. It is simply untrue that that paraffin tests do not produce false negatives. To rely upon the least reliable evidence and to ignore very good evidence is absurd. What do you think about the three construction workers on the 5th floor who heard the shells hit the ground right above their heads? What about the witnesses who saw a man sitting in the window with a rifle. Then there is all the physical evidence. Palm prints, finger prints, clothing fibers matched to the shirt Oswald was wearing, the fact that it was Oswald's rifle, the matching of the bullets to Oswald's gun to the exclusion of all other weapons. etc.
http://mcadams.posc.mu.edu/ptest.txt
http://mcadams.posc.mu.edu/factoid2.htm
This is completely wrong, the tests they did on the cast are still used today. They did spectographic and neutron activation analysis tests, both of which strongly suggest he hadn't fired a rifle that day. Try reading Pat Speers excellent chapter on this rather than using the one sided Mcadams site for everything.