ATLANTA (AP) The expanded use of drop boxes for mailed ballots during the 2020 election did not lead to any widespread problems, according to an Associated Press survey of state election officials across the U.S. that revealed no cases of fraud, vandalism or theft that could have affected the results.

The findings from both Republican- and Democratic-controlled states run contrary to claims made by former President Donald Trump and his allies who have intensely criticized their use and falsely claimed they were a target for fraud.

Drop boxes are considered by many election officials to be safe and secure, and have been used to varying degrees by states across the political spectrum. Yet conspiracy theories and efforts by Republicans to eliminate or restrict them since the 2020 election persist. This month, the conservative majority on the Wisconsin Supreme Court ruled that drop boxes are not allowed under state law and can no longer be widely used.

Drop boxes also are a focal point of the film 2,000 Mules, which used a flawed analysis of cellphone location data and ballot drop box surveillance footage to cast doubt on the results of the 2020 presidential election.

In response to the legislation and conspiracy theories surrounding drop boxes, the AP sent a survey in May to the top elections office in each state seeking information about whether the boxes were tied to fraudulent votes or stolen ballots, or whether the boxes and the ballots they contained were damaged.