Elusive Target (D20 Modern Feat)
From D&D Wiki
You can use opponents as cover when engaged in melee.
Prerequisite: Dex 13+, Defensive Martial Arts.
Benefit: When fighting an opponent or multiple opponents in melee, other opponents attempting to target you with ranged attacks take a –4 penalty. This penalty is in addition to the normal –4 penalty for firing into melee, making the penalty to target to you –8.
Special: An opponent with the Precise Shot feat has the penalty lessened to –4 when targeting the character.