What’s the biggest challenge in DNA analysis?

What are short tandem repeats? Why is STR the most widely used genetic marker for identifying humans? Why is sample quality, data analysis, and its interpretation important? How can contamination or degradation of samples be overcome?

What’s the biggest challenge in DNA analysis?
What are short tandem repeats? Why is STR the most widely used genetic marker for identifying humans? Why is sample quality, data analysis, and its interpretation important? How can contamination or degradation of samples be overcome?