There is no doubt that not all evidence is reliable. There are many factors that make evidence unreliable, for instance, personal experiences are difficult to trust because they are formed by ones person opinion of how they see the world. Personal observations are also unreliable because everyone sees one thing in different ways. There is bias in authority figures arguments. Even surveys are unreliable because people do not truthfully answer survey questions. As can be seen, it is difficult to determine whether or not the evidence provided is reliable, but, this is when you critical thinking skills come into play.
