You mean my 50 lb glass vial of mercury as robot ballast won't fly during inspection? What if I just hide it really, really well? Guess I'll change that to a small steel cylinder of Hydrogen, Oxygen, or Acytelene then.
No.....lead and mercury are both "Hazardous Materials." (As are the others I listed). If added to your Robot that is.
Now, where did I attach that compact 20 lb. nuclear weapon I used as ballast the last time it was needed? (Use simple common sense please).
Edited for Addition;
Sure enough I missed reading Al's #3 fully above...(Wouldn't even attempt that personally, due to the multiple venues, schools, and commercial arena's, we compete at in multiple jurisdictions each season, not to mention that eventually someone may wish to resize the ballast for wt. reduction eventually). Sry Al.