A DNA fingerprint can show whether two cannabis samples match at the markers a lab tested. A match on a panel that can distinguish close relatives supports a shared clonal origin, especially when the sample records point the same way. The strength of the match depends on which sites were tested, how many yielded good results and how well the panel separates plants in the group you’re comparing.
Start with the reference sample
If you have two cuttings sold under the same name, a lab can compare them directly. If you want to know whether either one is a particular named clone, you also need a reference sample with dependable provenance. Schwabe and McGlaughlin used microsatellite markers to compare named dispensary samples and found genetic inconsistencies within some names in their sample. That gives you a reason to verify the reference rather than treating the label as ground truth. See the cannabis fingerprinting study.
Ask whether the samples were compared with the same panel and scoring method. A lab might use short repeated sequences called microsatellites or a set of single-letter variants called SNPs. A report that says “all sites matched” is much easier to interpret when it also says how many sites were called and how many were missing.
What would change your decision?
Several clear differences on a well-performing panel are good reason to question shared clonal origin. If one site differs and sample quality is poor, check the identifiers and repeat the assay on fresh material before drawing a conclusion. If both profiles match but the panel tests only a few sites shared by close relatives, ask for a more discriminating comparison. If many sites failed, ask which samples should be recollected before paying to run a larger panel.
Keep the genetic result separate from observations about chemistry or growth. A matched marker profile helps answer the identity question. If the concern is that two cuttings look different, the relationship between genotype and growing environment is a separate question worth checking with comparable growing records.
