Perez became the ninth alleged illegal immigrant being charged with federal identity theft in order to gain employment at Howard Industries in Laurel.
The list of suspects continues to grow in federal court as after the August 25 raid at Howard Industries where nearly 600 suspected illegal immigrants were working.
Eight other suspects were charged with 3 counts of identity theft and entered pleas of not guilty four days earlier.
Testifying for the prosecution Friday was a special agent with Immigration and Customs Enforcement who said Perez was working under the name Jose Rodriguez.
It is not clear how and where the alleged fraudulent documents were obtained.