Answer:
In the shooting scene, you'd be able to collect the shell of the bullet and that would be one step to find out what type of gun the perpetrator used. You could go through nearby stores and look through their CCTV camera and find out what kind of car it was and maybe even catch a glimpse of the perpetrators face. However if the shooting was in a residential area you could go door to door looking for witnesses. To see if anybody heard or saw anything.
Answer: Your high school transcript
A fine. Ranging from $500-$1000, but some individual state laws may predict differently.
it is possible since hair doesn't readily decompose. If the rate of hair growth is 1.3 cm per month and his hair is 14 cm long, then it means that the test can still trace a drug that was ingested 11 months ago