As the trial proceeded, the government and SEC brought several witnesses (mostly former Tucker employees) to highlight the rudimentary methods used by Tucker to develop the car; the early suspensions were installed three times before they worked, and early parts were taken from junkyards to build the prototype. Answering back in Tucker's defense, designer Alex Tremulis testified that it was common industry practice to use old car parts for prototype builds, and pointed out this had been done when he was involved with developing the 1942 Oldsmobile under General Motors.