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New laws combating street violence in NSW have been slammed as "half-arsed" by a prominent anti-violence campaigner.

Enough is Enough campaigner Ken Marslew, whose son died almost 20 years ago when he was shot in the back of the head during a robbery, was commenting on the state's lockout and last drinks measures which came into effect this week.

Under the laws, which target drug and alcohol-fuelled violence, CBD and Kings Cross licenced premises must serve last drinks at 3am and enforce a 1.30am lockout.

The government agrees people will still be able to buy four drinks shortly before 3am.

Mr Marslew says that presents a loophole for people wanting to drink well beyond the curfew.

"The fact that you're able to stockpile at the end of the drinking session has to be done away with and the legislation should clearly state that," he told AAP on Tuesday.

"That has to be addressed and it's not that hard."

Mr Marslew, who in January praised NSW Premier Barry O'Farrell for showing leadership on the issue of violence, accused the premier of conducting policy on the run.

"This is simply a result of this government's half-arsed approach to the problem," he said.

"They're making this stuff up as they go."

Hospitality Minister George Souris defended the lockout measures, saying licenced venues would still need to adhere to the responsible service of alcohol rules.

"Serving intoxicated patrons can result in severe penalties and operational restrictions as part of the Three Strikes disciplinary scheme," he said in a statement.

Meanwhile, Mr O'Farrell says the second tranche of his government's anti-violence measures will be introduced in the lower house this week.

The new measures won't include minimum sentences for affray and assault occasioning bodily harm, as were mooted by the government in January.

There was concern mandatory sentences for affray and assault occasioning bodily harm would lead to a big rise in the prison population.

Mr O'Farrell explained the proposed laws would only target "serious personal violence".

The measures follow public outrage over the rise of serious drunken assaults in Sydney, including the fatal one-punch assaults on 18-year-olds Thomas Kelly and Daniel Christie in Kings Cross.