Dexter Season 6: Reasons He Should Have Been Caught By Now

Granted Dexter strictly follows Harry's code and instructions, we can count on our favorite serial killer to cover his tracks when acquiring the tools necessary for his elaborate kill room. 

That being said, even with his regular set of tools, Dexter's midnight activities require a great deal of disposable plastic wrap and other sterilizing materials. What are the odds in twenty some-odd years no cashier has ever thought it suspicious that Dexter purchases disposable materials in such vast quantities? Surely, he can't hit different vendors every single time.

Furthermore, where do the stained materials go after use? The bottom of the ocean alongside his dismembered victims? That's just pollution.

Methodical and sanitary as the Code of Harry may have taught Dexter to be, nothing foolproof completely prevents DNA residues like skin flakes or hair follicles from partially contaminating a scene. Ever watch CSI? That crap is everywhere.

Given the amount of time Dexter's been satisfying his dark passenger, it's a statistical certainty that DNA from both Dexter and his victims could be found somewhere around Miami that would arouse police suspicion. How's our boy to explain when DNA from a missing criminal turns up alongside one of Dexter's luscious locks?

We'll allow the necessary dramatic license that goes along with keeping a methodical serial killer hiding in plain sight amongst the very Miami Metro PD hunting for criminals like him. We'll even forgive Debra, on account of she's a f$%king idiot, but it doesn't take Doakes' level of obsession and paranoia to see something amiss about Dexter. The very qualities police and psych profiles methodically test for and deal with every day are written all over him.

Dexter's icy cool and calculated exterior have slipped plenty over the first five seasons. Any one of his closest friends at Miami Metro would have filed reports long ago at the first sign of his distress.

Harry does not know every in and out of the law, being more akin to a morally corrupt detective of a bygone era. Not only that, but he himself has had some serious issues with errors in judgement. He never once thought of seeking legitimate treatment for Dexter's horrible trauma!  A baby saw his mother murdered and sat in blood. Let's train him to be a serial killer!

These lapses in judgement paint a portrait of instability for Harry, who could never have fully prepared Dexter to be the inescapably clean killer we purport him to be. Sooner or later, someone would have been alerted to his criminal instruction of his adopted son.