Contamination with a different species you can guess
One of the biggest problems with sequencing libraries is that the material might be contaminated with something unexpected. One of the simplest forms of contamination is where you have material from a different species than expected. In many cases the rogue material will come from a species you can guess based on their other species commonly used in your lab. Screening for this type of contamination will help spot when you have contaminated samples, and can also help when you have completely switched samples.
