Is Blas Elias (formerly of the band Slaughter) a member of the Blue
Man Group in Las Vegas.

Hello.

Yes, Blas Elias has performed as a member of the Blue Man Group in Las
Vegas.

From the messageboard on the Blue Man Group's official web site:
"Does anyone know the names of the musicians in Las Vegas? ...
...
this is what is says on the back of the Vegas Paper...
...
blas elias ..."
Source: Blue Man Group messageboard 01-01-2002, on blueman.com
http://blueman.com/cgibin/fanboard/ultimatebb.cgi?ubb=get_topic;f=2;t=000611#000001

Also see this newsgroup message:
"The Vegas show is even more rocking. Blas Elias from Slaughter is the
main
drummer in that production, along with Tim Alexander on percussion."
Source: newsgroup message, 3/4/02, hosted by Google Groups:
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&client=googlet&selm=yOMg8.27913%242v6.1203111%40news1.west.cox.net&prev=/groups%3Fq%3D%2B%2522Blas%2Belias%2522%2Bblue%26hl%3Den%26lr%3D%26ie%3DUTF-8%26client%3Dgooglet%26selm%3DyOMg8.27913%25242v6.1203111%2540news1.west.cox.net%26rnum%3D1

Also, the Pro-Mark drum stick company identifies Mr Elias as a user of
its products and a member of the Blue Man Group:
"Blas Elias  TX2SW  Slaughter/Blue Man Group"
Source: Promark-stix.com:
http://www.promark-stix.com/products/drumset_corps_endorsers.html

search strategy:
blueman.com
google : "blas elias", "blue man"

I hope this helps.

Thank you for the quick and fast and great answer.

Thank you for the tip.
-juggler