New Technology using human hair instead of blood

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Researchers have developed a cutting-edge technique to identify human hair. This is the website where I found the new technology:

Discuss the reason blood has always been used for DNA tests etc.
What are the main problems that occur with blood samples.
Discuss why hair hasn’t been used in the past before this new technology.
Explain how researchers discovered that hair samples will be more effective and faster.
What tests did they conduct while developing this new tech.
When will this new testing method be allowed to be used by forensic investigators
Explain all the types of testing and the outcome you can get from the new hair tests, or what kind of info can you get on the person the sample belongs to.
Is there any newer advancements that they have already started or plan to start in the near future.