In the same year, Grieco moved to Florida in order to attend the University of Miami, where he received a juris doctor degree in 1999.

[1][2] After having been accepted into the Florida Bar, Grieco began his career as an assistant state attorney of Miami-Dade County, serving under Katherine Fernandez Rundle.

[8] However, on June 6, 2017, the Miami Herald reported that a political action committee named People for Better Leaders raised over $200,000 for the mayoral election.

[9] However, the PAC was found to be tied to him via his handwriting on documents, and a string of donors, including high-profile Miami Beach vendors, developers, and lobbyists, who testified that Grieco solicited their donations.

Rundle, the Miami-Dade state attorney, began a criminal corruption probe regarding Grieco's association with the PAC.

The donation, made in the name of Tony Rodriguez-Tellaheche, a Miami Beach realtor and Grieco associate, violated both Florida law, which makes it illegal to donate money to a political campaign in another person's name, and federal campaign finance law, which disallows foreign nationals from financially contributing to American elections.

[3] On May 4, 2018, just three days after the end of his probation, Grieco announced his candidacy for the 113th district in the Florida House of Representatives, seeking to replace retiring Democrat David Richardson.

[22] On June 1, Grieco posted on social media that he was dropping out of the race for SD-37 citing a lack of funds from various organizations and a reluctance from these groups to back his campaign.