I don’t get it

Can someone explain this to me?
New weapon launched in drug war
It’s all about the creation of a database of DNA profiles of cannabis plants that will be “ready for police operations in just over a year.”
As science, it’s interesting, but as a “weapon” for police, i really don’t understand it. What actual possible use would this database be in getting convictions?
Say that marijuana seized in a bust matches the DNA of other cannabis seized somewhere. What does that prove (that’s actionable) that the seizure itself wouldn’t already prove?

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