Apparently the ITTF Athletes Commission is looking into this among other things. Here are their recommendations...
Racket control has seen many changes since solvent based speed glue was banned in 2008.
The use of mineral oil boosters (a VOC-free alternative providing similar effects to speed glue) became widespread; so the International Table Tennis Federation introduced new rules and racket testing procedures to counter this trend.
Unquestionably, the Athletes’ Commission believes that nothing less than a level playing field for all players can be accepted. It is believed that many of the current racket testing procedures have become intrusive and not 100% reliable.
Athletes’ Commission Recommendations
.......Racket testing be completed pre-match rather than post-match.
……Racket testing procedures be relaxed and focused on eliminating dangerous VOC levels.
You can see the whole thing here:http://ooakforum.com/posting.php?mode=reply&f=25&t=18377
I wonder how much weight this will carry given that the ITTF seems to be on a "witch hunt" in respect to any alteration of the racket coverings. I mean the parts per million they have set is already beyond ridiculously low levels, when a new sheet of rubber has to be aired out before it can be used.
Good luck Athletes' Commission in bringing common sense back to racket testing.