The topic of Cu contaminated steels is not a new research topic, as investigations exist at least since the 1880. However, for most of the last century, this problem was mitigated due to the always available option of diluting Cu rich melts with fresh iron produced by the blast furnace. In the future diluting will get more and more expensive, as the production of iron is now shifting to hydrogen-based reduction, while most steel will be produced by recycling in the electric arc furnace. Therefore, an increasing interest exist on possibilities to remove, tolerate, or even use the Cu contaminations in steels. One boundary condition for these approaches is knowledge about the maximum concentrations which can be tolerated in a variety of steel great, however due to the above-mentioned reasons, experimental data is very scarce. Therefore, detailed and standardized investigations are necessary to assess the susceptibility of steel grades to Cu contamination. In this study, we first give a detailed description of the metallurgical phenomena which are associated with Cu contamination, outline different approaches for addressing these topics and finally show an approach to measure the susceptibility of a standard quench and tempering steel. Finally, we will discuss a research road-map for holistic addressing further aspects.