[M4D]

A tip:
Make a variable fo example like this:

PlayerDamaged[MAX_PLAYERS][MAX_PLAYERS];

In OnPlayerTakeDamage :

PlayerDamaged[playerid][issuerid] = 1;

That mean issuerid gave damage to playerid

And in OnPlayerDeath callback check if killerid never give damage to playerid > playerid using fake kill

OnPlayerDeath:

if(PlayerDamaged[playerid][killerid] != 1) Kick(playerid);


It isn't 100% accurate but better of checking TickCount
Maybe cheater use fake kill slowly and 1 per 10 sec