Jackal is one of the most banned operators in years. I think his eyenox is too powerful even without a scan. There are many ways to nerf it: for example by reducing the visual range of the footprinst, making him follow them much more and exposing himself more to enemies. Another way to achieve the same goal is to dynamically reduce the same range, based on the movement speed of (when you stand still the range is at its maximum, when you run it is at its minimum, for example 3 meters). It will make the ability much more realistic and Jackal will no longer run following the footprints like he does now. He will be more cautious and slow.