Which of the Following Procedures Is Not to Be Followed

Which of the following procedures is not to be followed in collecting and packaging firearms evidence at the crime scene?

A) Unloading a weapon before shipping it to the crime laboratory.
B) Avoiding inserting a stick or pencil into the barrel of a weapon.
C) Marking an empty cartridge case on its base for identification.
D) Marking a fired bullet on its base for identification.
E) Making accurate measurements of exact locations where cartridge cases are found.