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Practicality:

• NO2 will inhibit bacterial growth
• It's really expensive
• It is extremely flammable, so you'll have to worry about ventilation.
• Storing a flammable gas under pressure in a non-certified container (your keg) could be risky. You may have to worry about static electric build up and whatnot.

Legality:

Via my grandfather who is a dentist: Nitrous oxide is legal to own under federal law, but state law varies like Brandon mentioned above. Recreational use is most likely a misdemeanor. I'm not sure if the bubbles in the beer being ingested would constitute recreational use. Like you said, they use it in whipped cream all the time.

Practicality:

• NO2 will inhibit bacterial growth
• It's really expensive
• You'll have to worry about ventilation.
• EDIT: I was incorrect in my statement saying that NO2 is extremely flammable. Thank you for the correction, Brandon! But the fact remains that a static discharge can cause a violent decomposition of the molecule when under pressure. And a static discharge will be more likely in a non-certified container (your keg). Source

Legality:

Via my grandfather who is a dentist: Nitrous oxide is legal to own under federal law, but state law varies like Brandon mentioned above. Recreational use is most likely a misdemeanor. I'm not sure if the bubbles in the beer being ingested would constitute recreational use. Like you said, they use it in whipped cream all the time.

Practicality:

• NO2 will inhibit bacterial growth
• It's really expensive
• It is extremely flammable, so you'll have to worry about ventilation.
• Storing a flammable gas under pressure in a non-certified container (your keg) could be risky. You may have to worry about static electric build up and whatnot.

Legality:

Via my grandfather who is a dentist: Nitrous oxide is legal to own under federal law, but state law varies like Brandon mentioned above. Recreational use is most likely a misdemeanor. I'm not sure if the bubbles in the beer being ingested would constitute recreational use. Like you said, they use it in whipped cream all the time.

Side note: The "Force carbonating with something other than CO2" title is a little misleading when you're asking about the legality of using nitrous oxide.

Practicality:

• NO2 will inhibit bacterial growth
• It's really expensive
• It is extremely flammable, so you'll have to worry about ventilation.
• Storing a flammable gas under pressure in a non-certified container (your keg) could be risky. You may have to worry about static electric build up and whatnot.

Legality:

Via my grandfather who is a dentist: Nitrous oxide is legal to own under federal law, but state law varies like Brandon mentioned above. Recreational use is most likely a misdemeanor. I'm not sure if the bubbles in the beer being ingested would constitute recreational use. Like you said, they use it in whipped cream all the time.

Practicality:

• NO2 will inhibit bacterial growth
• It's really expensive
• It is extremely flammable
• Some potential legal concerns

Legality:

Via my grandfather who is a dentist: Nitrous oxide is legal to own under federal law, but state law varies like Brandon mentioned above. Recreational use (which this would fall under) is illegal and most likely a misdemeanor.

Side note: The "Force carbonating with something other than CO2" title is a little misleading when you're asking about the legality of using nitrous oxide.

Practicality:

• NO2 will inhibit bacterial growth
• It's really expensive
• It is extremely flammable, so you'll have to worry about ventilation.
• Storing a flammable gas under pressure in a non-certified container (your keg) could be risky. You may have to worry about static electric build up and whatnot.

Legality:

Via my grandfather who is a dentist: Nitrous oxide is legal to own under federal law, but state law varies like Brandon mentioned above. Recreational use is most likely a misdemeanor. I'm not sure if the bubbles in the beer being ingested would constitute recreational use. Like you said, they use it in whipped cream all the time.

Side note: The "Force carbonating with something other than CO2" title is a little misleading when you're asking about the legality of using nitrous oxide.