Police officers often administer a lie detector test because they believe that it is a very useful investigative tool. Courts, however, hold the belief that the results of lie detector tests are unreliable.
In cases of murder, the sentence is automatically a life sentence whether that’s first degree murder or second degree murder.
There are two main reasons why a murder investigation ends up in a trial. The primary reason is that the accused person is not guilty and they’ve made it clear that they’re not guilty. The second reason that a murder case ends up in a trial is that there is no incentive for a person to plead guilty to first degree murder.
In a recent case that was well publicized in Ontario, the accused actually entered a guilty plea to a sexual assault that he did not commit. In subsequent years, it was determined conclusively to be a crime that was committed by someone else.
Sometimes, DNA evidence is very clear, butut in many other cases, DNA will be obtained from a very poor sample.