When examining handwriting evidence at a crime scene a forensic scientist may think that they know who the criminal is, however, they must take in to account these things:
*If a criminal was really smart they could forge their own handwriting
*Handwriting can change depending on what writing instrument you are using, for example a pen or a pencil
*Handwriting can change depending on your mood, if your happy your handwriting tends to go up while if you are mad your handwriting may go down
*Handwriting can be smugged depending on where the piece of paper goes or if it gets wet
*A criminal can trace another person's handwriting in order to frame the other person
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