The Mosiac law was a "Tutor leading to Christ"in that it showed man, even when he had it spelled out to him what to do, it wasnt in his abilities to follow it to the extent that he could achieve his own salvation.
The Christ therefore, freed us from the burden of the law, died in our place, and established salvation based on Gods grace rather than our own proven failed abilities to achieve salvation by works.
The JWs however, have rejected the Christ by rejecting his grace, hense they have to achieve salvation by works, whilst they have admitted the abolishion of the Mosiac law, they have created their own law, and claimed it was from God, whereas it is doctrines of men.
Whilst they have decided to use much of the Mosiac Law in their new law, they have added much too it.
Stoning to death is no longer allowed in this secular world, so instead the Witnesses employ a figurative form of capital punishment where you are as dead to the rest of the religion, and you are promised real death when God executes his judgement. It is called disfellowshipping and shunning.
Some laws of this new Jehovoric Law and that wernt in the Mosaic law and that have the death sentence include
Smoking
Communicating with ex JWs, (though this could be construed as communicating with the dead so is the same as the Mosiac law),
Not acknowledging the God given sovereignty the GB has over the flock or questioning their infallibility.
Much of the death laws of the Mosiac law are still retained by the JWs, such as Adultery and Astrology.
The Jehovoric Law has many more minor laws though that were not in the Mosiac Law
These forbid:-
Watching James Bond films
Being with members of the opposite sex
Masterbating
Having sex with your spouse in a way that goes beyond the missionary position
Doing the twist
Watching TV soap operas
Celebrating Birthdays
Playing with Sparlock toys
Having friends outside the org, (though this was part of the Mosiac Law also to be seperate from the Nations).
Etc Etc
The most important part of the Jehovoric Law regarding the earning of salvation however, is the field service, the more you do, the more chance you have of being able to earn everlasting life independant of Jesus sacrifice, for another of the Jehovoric laws is that once a year, you must demonstrate to Jesus what you think of his "Grace", by rejecting the emblems of his New Covernant for the forgiveness of sins, you will stick to your salvation bt works thank you very much.