An effective validation procedure should discard as many wrong TSs as possible while not removing true transition states. The requirement, that the found transition state should have exactly 1 imaginary frequency is fulfilled for all 83 found TSs, but is also fulfilled for all but 1 (TS optimization failed) of the wrong transition states. Though the requirement can be applied without fear of throwing away true TSs, it is not very effective in filtering out wrong TSs. The requirement, that the TS structure should have at 6/22 transition state structures would have resulted in six correct TSs being filtered out. The last validation test, that the displacement vector of the imaginary frequency should be along at least one of the active bonds given the cutoff value above, is not fulfilled for nine of the transition states confirmed to be true by an IRC. Requiring all three validation tests to be fulfilled would have resulted in 13 of the 83 true transition states to have been filtered out. Four out of eight of the wrong transition states would also have been filtered out, but one needs to be very careful when applying these alternative validation tests, considering whether the saved computational time is worth more than the wrongly rejected transition states.