Section 122

When any goods suspected of being prohibited or uncustomed or otherwise liable to seizure have been seized, it shall be sufficient to open, examine and, if necessary, test the contents of such proportion of the goods seized as the proper officer of customs may determine and the court may presume that the goods contained in the unopened packages or receptacles are of the same nature, quantity and quality as those found in the similar packages or receptacles which have been opened.

Evidence of analysis may be given in writing.