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Another useful tool - GEDMATCH
If you have a DNA test done, most places will allow you to download your DNA datafile, making it "portable". You can then "plug in" this datafile to other ancestry sites, into offline apps like "GRAMPS", or into medical apps that examine the DNA for potential medical issues (recommended if you are adopted, as you have no real medical "history").
PROMETHEASE used to be a stand alone medical DNA analyzer, and quite valuable. It has recently been purchased by MyHeritage. For $5, you could obtain a voluminous report covering every aspect of your DNA leanings in the medical direction. Your DNA file was deleted after so many months or you could delete it yourself anytime.

Back to GEDMATCH - this app made headlines recently when it was used to find the "Golden State serial killer". If you sign on now, a warning will be posted that law enforcement can access your file unless you "opt out".
I strongly suggest opting out. Personally, this is a bad idea for many reasons. Any good defense lawyer should be able to get any case made based on this data thrown out as inadmissable.
My reasons are as follows: If you read any of the terms in your DNA test places they all mention that the tests are largely for "entertainment" value and "general population research". Like any business, they try to do the most with the least. the number of genetic markers they use varies from company to company, but since DNA extraction research is expensive, they use the least that can give some results. The tests are not "government grade", in other words.
Secondly, there is no "evidence chain" as there must be in any criminal investigation. no one oversees the transfer of each tube of collected DNA to each test result. No one even knows if the DNA you submit is your own, your neighbors, or your dogs. There is no guarantee that the test results you receive are even yours.
Lastly, using "matching DNA results" for criminal investigations puts you in a "virtual line up" without your knowledge. You are never told you are a suspect or "person of interest". If you are an adoptee, or have a family member that was adopted, you may suddenly find yourself subject to a violent SWAT move if your "biological" relative just robbed a bank somewhere.
To even use these sites for this purpose, law enforcement must lie about who they are and where the DNA comes from. The terms state that DNA submitted must come from you, or that you have the subjects permission to upload the sample. Obviously this is not the case when law enforcement uploads a sample of DNA they obtained at a crime scene.

ALL THAT SAID - Gedmatch is a resource you DO want to use, but please, opt out of the law enforcement data sharing.

"...On May 18, GEDmatch changed its rules relating to matches with kits uploaded by representatives of Law Enforcement. All previously existing DNA kits in the GEDmatch database were set to 'opt-out' of these comparisons. This change affects searches for unknown bodies and violent crimes. If you wish to include your kit in these searches, you need to click on the 'Police' icon to the right of your kit number on this page. If your kit was previously marked as 'Research', you will need to use the 'Pencil' icon to opt-in..."