I was joking but now I feel my sense of plausability is being challenged.
I am unsure what you would expect to find on a knife that is
a. Withdrawn from the wound by my own hand
b. covered in my blood
c. discarded into my sink along with various dirty dishes, whilst i attend to my wound with first aid kit that I keep in cupboard above my sink...
As I alluded to previously, CSI Miami is not how the real world works, a dead Burglar, a stabbed victim, would of course create a cursory investigation, but as long as you got the angle of entry into your own arm plausibly right, and created a reasonable story as to why the knife was left in a place that was in the path of the Burglars entry to the house, teh facts would hold up enough to clear your story.
Shorty of a creating your own downfall getting caught in an over elaborated lie (no need), or breaking down under pressure in the cautioned interview, there is no way your word wouldnt be held up.
1 dead Burglar, worlds a safer place....