Texts show Trayvon Martin was in "hostile" mood the day he was shot by Zimmerman

Martin's past drug use might be irrelevant, but these texts seem pretty relevant to me.  The question is how far back in time the texts should go.  From CNN:

. . . The texts speak to Martin's demeanor and emotional state, the Thursday filing said, and "may assist the jury in understanding why Trayvon Martin chose to hide then confront George Zimmerman rather than simply going home." 

The filing said the texts were mostly with "Witness 8," and the messages showed Martin and the friend were "hostile and angry with each other at various points throughout the day." . . . 

Also in the document, Zimmerman's attorneys say the court should also consider text messages sent before that day, because they establish Martin's marijuana use and fights he had been involved in.

"This (fighting) evidence is admissible in support of Mr. Zimmerman's self-defense claim regarding the abilities and capacity of Trayvon Martin as an experienced fighter," Zimmerman's attorneys wrote. . . .