topic suggestions for master that links molecular biology and drugs residues in livestock s products [on hold]

I'm a vet i work as research assistant in some reaerch lab.my work is basicly focusing on monitoring the veterinary drug residues and prohibited substances in livestock proudcts.im so intersted in molecular biology i want to start a master dgree by research in molecularbiology and i need your help by suggesting a topic that links drug residue with molecularbiology