Lara used ninhydrin. Ninhydrin is generally applied with a spray bottle, and will work with the amino acids within the evidence to produce a purple-effect. This is also known as Ruhemann’s Purple.
The answer should be Arizona v. United States (2012). One of the main points brought up by this ruling was an Arizona state-law making it a crime for being unlawfully present in the United States. This made it more likely for a Hispanic person to be racially profiled by law enforcement.
I hope this helps! :)
