Here it is :
"While the rover's Sample Analysis at Mars, or SAM, instrument detected signs of an oxygen-chlorine compound -- perchlorate -- and trace amounts of chlorinated methane compounds, which contain carbon, researchers say more tests are needed to make sure the carbon originated with the sample and was not brought to Mars aboard Curiosity."
Source >>
Spaceflight Now | Mars Science Lab | Mars rover soil test results not definitive on organics yet
As expected, more or less.
