Exculpatory (free from guilt or blame) materials must be disclosed through discovery to the defense counsel by the prosecution when the defendant is to be tried for a crime.

From Brady versus Maryland, 373 U.S. 83 (1963), in which the Supreme Court ruled that suppression by the prosecution of evidence favorable to a defendant who has requested it violates due process.

1. Engineers who develop methods to process and convert metals and other materials into usable forms.
2. Technology is developed to produce ceramic substances, new compounds, and metal alloys for use in computers, spacecraft, and industrial equipment.

These engineers develop new materials for applications that require exceptionally high strength and heat resistance and they also determine how materials fail, using instruments; such as, microprobes, scanning electron microscopes, and X-ray diffraction and examine failed, broken, or contaminated materials.

Semiconductor material, typically measuring from 200-400 microns thick, which is cut from ingots or ribbons.