: If we decide to sue for false arrest our legal bill will be over $20,000(A rough figure given by an attorney). Those hours add up at over $300/Hr.
I don't see how you can sue for false arrest, since you'd be suing the cops in that scenario, not Home Depot. Why not sue Home Depot--since presumably there is video that would confirm your sons' story--and find an attorney who will take the case pro bono, and will only collect if you win a settlement?
Both HD and the individual LP person are subject to lawsuit for false arrest since they are the ones who originally detained the accused and called the police.
In short, you bet your butt you can sue for false arrest when detained by store security.