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> If the police felt free to use it in an assault case, why not shoplifting, trespassing or littering?

For the same reason dna tests are not already used for shoplifting, trespassing or littering?



Cost, which is falling. (See https://en.wikipedia.org/wiki/Carlson_curve )


And that reason is...?


DNA has almost no probative value in those cases, since they almost never involve a sample which can be genotyped that has a high probability of being linked to a particular crime.




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