Eating salad is safe but I don't do it cause I don't trust the Subway's near me to keep their salad fresh/clean.

Pre washed salads are actually a higher risk than deli meats for listeria. I have avoided eating salads out as all fast food places and most restaurants use pre washed lettuce. I believe fast food places get the majority of there foods pre-washed and prepped or they prep days in advance. But in saying that the risk is still low and it is rare for people to get sick.