any judge, lawyer, teacher etc. who is good at their job
Any lawyer worth his salt should be aware of the latest changes in taxation.(Cambridge International Dict. of Id.)
No judge worth her salt would attempt to influence the jury.(Cambridge International Dict. of Id.)
I don't think any judge worth their salt has a problem putting their expertise in their part of this art form out for scrutiny after all it is what we ask the dancers to do every single time they compete why should judges be any different.....??? Google