Jehovah's Witnesses, Blood, Fornicating Animals and Leeches

Leviticus 17:10

"`As for any man of the house of Israel or some alien resident who is residing as an alien in YOUR midst who eats any sort of blood, I shall certainly set my face against the soul that is EATING the BLOOD, and I shall indeed cut him off from among his people.  

A question comes up, was this ever put in force? Why do I ask this? Because there are scriptures showing God following through with what he say's.  For instance, the Ten commandments talks about taking Gods name in vain.  Is there an account of some one taking God's name in vain?

Leviticus:

24:11
And the son of the Israelite woman began to abuse the NAME and to call down evil upon it.  So they brought him to Moses.  Incidentally, his mother's NAME was Shelomith, the daughter of Dibri of the tribe of Dan.

24:12
Then they committed him into custody till there should be a distinct declaration to them according to the saying of Jehovah.

24:13
And Jehovah proceeded to speak to Moses, saying:

24:14
"Bring forth the one who called down evil to the outside of the camp; and all those who heard him must lay their hands upon his head, and the entire assembly must pelt him with stones.

24:15
And you should speak to the sons of Israel, saying, `In case any man calls down evil upon his God, he must then answer for his sin.

24:16
So the abuser of Jehovah's NAME should be put to death without fail.  The entire assembly should without fail pelt him with stones.  The alien resident the same as the native should be put to death for his abusing the NAME.