When inspectors found suspicious nuclear material at this site, the Iranians said it was just contamination.

BBC

Scientists are excited about that because the first sample could have been tainted by material analyzed at a different site on Mars.

CNN: NASA: Yes, Mars could have hosted life

For instance, Arrow keeps three material planners on-site at AMX who handle parts flow and look for ways to substitute parts that Arrow can supply for less.

FORBES: Stuck in the Middle