There appears to be an increasing number of posts drawing the comment "...search first".
I use it, and it is very rare - 2 or 3 out of all my posts - that a duplicate occurs... and that is the result of naming differences. I also adopt the policy of "if in doubt, leave it out!" to avoid the likelihood duplication.
It only takes a second, and it prevents being jumped upon...
With the volume of posts here, it should be standard procedure.
Perhaps a sticky at the top of each posting forum might help...??