Hundreds of WinXP machines launching a DDoS attack using forged, possibly rapidly varying, IP addresses will not be filterable by the targeted victim's ISP, and will without doubt succeed in swamping his/her link.
The SLAP will be filterable and scalable to support the operational needs within a theater at local nodes while also allowing for integration of a more global view at higher levels of command.
In 1917, d' Herelle had discovered a self-propagating filterable substance capable of dissolving dysentery bacilli, later identified as bacteriophage.
These packets are however filterable because they are illegal.
Scrapie is a chronic disease of sheep which is transmitted by a filterable particle that is resistant to heat and formalin fixation.
They are filterable , to some extent isolable, can be handled in test-tubes, and their properties, as shown by their effects on the bacteria, can then be studied after treatment.