Mars rover Curiosity is theoretically capable of infecting Mars due to the negligence of NASA engineers

The rover Curiosity due to the negligence of NASA employees may have become dangerous for the planet he is studying. During the final work on the drills, the technicians violated the tightness of the already sterilized container with drills, and infected it with terrestrial bacteria. When it came to light, it was already too late to change something ...

NASA engineers, who shortly before the launch of the rover, independently installed an additional drill on the device, which was kept together with other drills in a sealed box, were to blame for the Curiosity “infection”. It was supposed to open only upon arrival on Mars, and all the Boers were previously sterilized. However, NASA employees have violated the vessel's tightness by letting in terrestrial bacteria, and did not re-sterilize.

Theoretically, there is a danger that when examining ice samples, bacterial spores can get into a favorable breeding environment. A significant part of terrestrial microorganisms must necessarily die due to the aggressive environment of Mars: hard ultraviolet radiation, temperature drops, unusual atmosphere. But some can survive. Some terrestrial bacteria survive in the vents of volcanoes, where the habitat is not as an example more aggressive than on the Red Planet. Imagine such a situation: in a few decades, researchers arrive with another expedition to Mars and, instead of finding extraterrestrial life there, they find terrestrial microorganisms that are familiar to them, adapted to the new environment.
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If the rover is still able to detect water on Mars, he will have to explore it with other methods without using a drill rig.