From that "lefty MSM" news organization Al-Jazeera:
"Trump said Abrego Garcia “had ‘MS-13’ on his knuckles tattooed … He had MS as clear as you can be, not interpreted.”
The figures M, S, 1 and 3 and the words below the symbols do not appear in other photographs of Abrego Garcia’s hand, including one shared by the Salvadoran government.
Experts in MS-13 and other gangs say the pictorial tattoos shown are not typical designs for MS-13 or other gangs, and they say that several of those tattoos are commonly used by people unaffiliated with gangs.
We rate the statement Pants on Fire!"
https://www.aljazeera.com/news/2025/4/30/does-abrego-garcia-have-ms-13-tattooed-on-his-knuckles-as-trump-claims