Tell me

Jessie Dotson was born in 1975, but his troubles with the law didn't begin until he reached the ripe old age of 15, when Dotson was charged with disorderly conduct for making threats against his mother as she tried to discipline him. A month later, he was charged with assault after a 13-year-old told his parents Dotson punched him in the face and threatened to "put him in the hospital" if the younger teen didn't bring Dotson $25 the next day.

The following year (1991), Dotson wanted to beat up his brother, so his mother locked him in a bedroom. Dotson escaped by breaking open the door, and then punched holes in the walls and threatened to kill his mother. He was arrested for disorderly conduct. That same year, the 17 year old Dotson was also arrested for possession of a sawed off shotgun and a pistol.

In 1992, he was arrested again for disorderly conduct because of a fight with a neighbor.

It was in 1994 when he was arrested for committing his first murder and served fourteen years in state prison. Just three days after his release in January of 2008, Dotson pulled a gun on his brother and threatened to kill him over a coat that Dotson was attempting to steal from his brother. The brother called the cops, and no arrest was made.

Dotson went to the brother's home several weeks later, and shot or stabbed everyone there. Six people were killed by gunfire, including Dotson's brother and three other adults, Dotson's two nephews were stabbed and murdered. The nephews were 2 and 4 years old. Three other children, aged 2 months, 6 years, and 9 years, were left for dead after also being stabbed.

Since Dotson was under age in 1991 when he was first caught with firearms, tell me how gun control worked.
Since possession of an unregistered sawed off shotgun is illegal, tell me how registration worked.
Since he was a convicted murderer, tell me how gun laws worked.