Ms. Dookhan deserves 20 years.
Should have been shot IMHO.
When somebody undermines the confidence in the justice system, that to me is worthy of the death penalty.
She deserves a unique and different kind of sentence. One year for each year that an innocent man spent in prison because of her falsehoods. She can start right now, but the end date won't be known for quite a while. Possibly thousands of years.
Only 20? Look at how many lives she messed up. I am not saying they were all perfect angels but everyone deserves a fair trail under the law and she denied them that.