Microfluidic devices for analyzing cellular components from biological samples which contain more than one cell type are provided. The microdevice separates cells by type, releases cellular components such as DNA (e.g. by cell lysis) and processes the cellular components (for example, by amplification) to generate products of interest for further analysis. Samples that can be analyzed using the microfluidic devices include forensic samples such as samples from sexual assault victims, and the products of interest include short tandem repeat (STR) amplicons for DNA profiling.