More than 200 self-acknowledged noncitizens have managed to register to vote in Arizona’s Maricopa County and at least nine of them have cast ballots in federal elections, according to a report. The study is the first in a series of reports by the Public Interest Legal Foundation to coincide with the 30th anniversary of the Motor Voter law.

The Public Interest Legal Foundation, a public interest law firm focused on cleaning state voter lists, has launched a new interactive tool for concerned citizens to monitor their states’ voter rolls. The database lists current voter roll errors in all 50 states’ voter lists including duplicate registrants, deceased voters or those who have moved out of state, and voters registered at commercial addresses.

“Mail ballots disenfranchise. There are many reasons mail ballots fail ultimately to count,” J. Christian Adams, President of the Public Interest Legal Foundation said in a press statement. “No one casting a ballot at home can correct an error before it’s too late. California’s vote-by-mail demonstration should serve as a warning to state legislators elsewhere.”