I believe the answer is Gold.
Gold was a very hot commodity at that time because before we use paper/digital money like today, Gold was made as material to make a type of money with more intrinsic value.
The abundance of this natural resources led to many European empire came and started their colonization in AFrica.
It required government searches and seizures to be conducted only upon issuance of warrant, judicially sanctioned by probable cause, supported by oath or affirmation, particularly describing the place to be searched and the persons or things to be seized
