How can America locate illegal criminals when the pro amnesties says its profing immigration?

For an example advocates for illegals are arrested ,found to be in country illegally,now are sitting in jails adovates say to check out such people would lead to racial profiling ,why is this.? Do the advocated expect us to allow any illegal regardless of the to be granted probation and being in the country illegally is the same as running a red light. How do we deport any foks in jail whn advocates claim it will lead to profiling? Should we not not check anyone at both borders as it would lead to racial profiling.. What do we do ?