There has been some interesting debate in the comments about the evolving nature of halacha. I wrote a dvar torah two years ago on this subject (for Parashat Shoftim), and I would love to share it with you.
The one-line summary is that the Torah instructs us to consult judges from our own generation who are able to interpret and understand the unique needs of our time.
Check it out for yourself:
“Parashat Shoftim: What do I do?” (Care of: Eimatimes.com)