CAMDEN, N.J. (AP) — A New Jersey mother who recognized the face of a Census worker from the state’s online database of sex offenders called police, leading to charges that the man used a fake name and Social Security number to get the government job.

Amy Schmalbach told The Philadelphia Inquirer that she usually doesn’t open the door when she’s at her Pennsauken home alone with her toddler son, but she did for the Census worker on May 4 because he was a government official.

Schmalbach said she spoke with the man, who identified himself as “Jamie,” on her porch and remembered seeing a similar looking man on the state’s website of registered sex offenders. The face stood out because the man had 16 aliases, including “Phanton Flam” and “Toot Flynn,” she said.

She called Pennsauken police. They arrested him the day after he visited Schmalbach’s home, and he has been in custody since.

Federal prosecutors charged him Wednesday with using a fake Social Security number in the application he filled out in March to get the Census job.