I think that students should be allowed to be reassessed. There are many different things that can influence the outcome of a test. Everybody deserves a second chance to prove themselves, especially on tests in school because many are important for the student's futures. I think at least 1 reassessment should be allowed.
If students knew that could get a second chance at getting graded then they probably would not take the first assessment as serious as they would have if they did not have a second assessment. It is probably better to just have them focus on the one assessment as apposed to two.