The kind of the case. As an example, If your evidence of infidelity is necessary, the retainer could possibly be better – around $5500, Whilst for simple databases digging a consumer may have to deposit as small as $five hundred. A professional PI may also demand you a retainer upfront. http://www.drugoffice.gov.hk/gb/unigb/www.openlearning.com/u/isabelvelasquez-skx4ec/blog/01