This stuff needs to be argued so it can be preserved for appeal. The jurors may not care about chain of custody issues but I suspect the appellate courts will.depends... is that is an effective tactic or not? again - the defense alleges a vast conspiracy. collecting blood in solo cups isn't police 101 - but time was of the essence and it doesn't feel like the actions of a conspiracy member.
harping on stuff like that vs. the "dog bites" - might start to make some jurors think the defense is just throwing slop at a wall and that might hurt.
look if the defense can prove those are dog bites - the whole case looks different. that alone might be enough to sink or break the case. blood in cups is nonsense... unless the defense is alleging mystery blood or whatever.