@CNN: Bombs and chemicals sent through the mail are rare but terrifying events. Here’s what postal services and government agencies look for when determining whether a package is suspicious. https://t.co/1ZvFWaN7Lx

@CNN: Bombs and chemicals sent through the mail are rare but terrifying events. Here’s what postal services and government agencies look for when determining whether a package is suspicious. https://t.co/1ZvFWaN7Lx