Methods to Implant Serial Numbers in/on Clones

I am writing a science fiction story with mass produced clones. Since I have a number of clone I need to tell them apart. The ID system must be:

• Permanent over the lifetime of the clone (call it 150 years)
• Very difficult to tamper with (radio frequency transmitters can be excised, etched bones can be re-etched -- hard to read anyway)
• Not overly harmful to the clone (clones are only valuable if they function like humans)

Can I use DNA to do this, by simply adding several codons to an existing DNA strand (assuming quick, basically immediate, and accurate Polymerase Chain Reaction - PCR)? Could you modify the clone by rewriting his/her DNA thus causing a serial number to appear on the skin and still detect the genes responsible with PCR (this would should meet the criteria above - two level verification between skin and genetics seems a secure methodology)? Could either of these techniques be used to modify the clones genetic strucure prior to inception thus changing the DNA of all cells within the cloned organism?

Note: The following wikipedia article might provide a start in responding to this post (https://en.m.wikipedia.org/wiki/Gene_therapy)?

posted over 6 years ago

Englishman Bob‭

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