The legislation was introduced by the government of Queensland’s premier, Annastacia Palaszczuk, to quell alcohol-fueled violence, but venue owners and bar patrons have voiced frustrations over its rollout, which they say has led to long lines, declining revenues and concerns over data security.

Ryan Lane, general manager at the Gresham, a bar in Brisbane, said that while scanning IDs could make nightspots safer, the government’s failure to consult with the bar industry over the new rules had hurt quieter establishments.

Just last month, the Gresham made headlines by turning away a dozen French winemakers who had not brought identification.

“Perfectly sober. Well dressed. Incredibly polite,” Mr. Lane said in describing them. “They finished their workday and wanted a nightcap before their hotel.”

“It was so embarrassing,” he added. “And on the world stage, we look a bit silly.”

Additionally, scanners must be approved by the government and can only be operated by licensed operators, which can rack up the costs of enforcement. One venue owner, Jamie Webb, told the local news media last month that he lost about 25,000 Australian dollars, or about $20,000, in one week.

The government has acknowledged there would be “teething issues” but has stood by the legislation.

In Queensland’s Parliament on Tuesday morning, Yvette D’Ath, Queensland’s attorney general and minister of justice, said that about 1.4 million people had entered licensed venues with scanners and that banning orders involving 76 people had been found.

“We will never truly know how many lives are saved and how many assaults we stop by having these scanners in place,” she said, “But knowing that parents are more likely to have their child come home safe because they are there,” she said in reference to the scanners, “is worth it.”