This could happen as a result of negligence, ignorance, and/or insufficient information; weaknesses in the surveying, storage, and handling procedures and practices; inadequate tank cleaning procedure; abnormal trade practices; etc. The chances of contamination with undesirable foreign substances is high because chemical tankers that are used to carry palm oil are also used to carry other chemicals that are undesirable and foreign to palm oil. This is definitely an important area in which vigilance is necessary.